by Mary Roach
So the Army is building a dummy of its own. WIAMan—the Warrior Injury Assessment Manikin—will be specifically tailored for underbody explosions. The project employs about a hundred people (most of whom, as far as I’ve been able to determine, have never watched Jackass and thus had no knowledge of the dwarf cast member Wee Man).
WIAMan is starting the way the automotive crash test dummy people started: with cadavers and bioengineers and controlled blasts of varying magnitude, followed by autopsies to document the injuries. Before they could start any of that, they had to build a blast rig, something robust enough to withstand an explosion directly below it. The tower, as it is conversationally known, stands in a meadow near what the mapmakers call Bear Point and the Aberdeen Explosive Effects Branch calls Experimental Facility 13. I am headed over to EF13 after lunch. The cadavers are there already, sitting in seats on the tower platform. They arrived a day ago from bioengineering labs at three universities. Some made the trip in a modified horse trailer, disappointing the children in passing cars craning their necks for a glimpse of tail or rump.
EF13 IS lovely this time of year. A late October sun softens the chill and highlights the white butterflies that flit around the bioengineers as they work. The clearing is edged by oaks, changing their outfits before dropping them to the floor. The cadavers too, wear fall colors, one in an orange Lycra bodysuit* and one in yellow. For now, they sit slumped in their seats, chins on their chests, like dozing subway commuters.† Because the setup takes two days, the dead men spent the night in the meadow. A portable weather shelter was erected to protect the electronics, and a pair of guards took turns watching from a truck parked nearby. Bear Point may not have bears anymore, but it does have coyotes, and neither death nor Lycra dampens a coyote’s enthusiasm for meat.
Under the platform is a small plot of simulated Middle East: engineered soil that has been heated and moistened as per protocol. Consistency and repeatability being key elements of the work. At around 2:30 p.m., a pickup truck will arrive with a few pounds of the explosive C-4, which everyone here has been referring to as “the threat.” Around 2:45, the bioengineers and investigators and hangers-on like me will be escorted to a nearby bunker while the threat is buried in the special dirt and a detonating wire is attached. Then the wood staircase to the tower platform will be pulled away (so the carpenters don’t have to keep rebuilding it), and an alarm will sound three times. After which the threat becomes the event. The Tower, the Threat, the Event. It’s like a tarot deck out here.
It’s just past noon now. The cadavers are having their connectivity rechecked after the long drive in. Data will be gathered from sensors mounted on their bones and then transmitted along wires laid down along the insides of their limbs and spines—a sort of man-made nervous system. As with the real deal, the nerves lead to a brain, in this case the WIAMan Data Acquisition System. A bundle of wires exit at the back of each specimen’s neck and feed into the system.
After the blast, the cadavers will be autopsied and the injuries documented. This is the information that will allow vehicle evaluators to interpret the g-forces and strains and accelerations that WIAMan’s sensors will register. Because of the cadavers’ contributions, WIAMan will be able to predict what kind and what degree of injury these different magnitudes of force would be likely to cause in an actual explosion. WIAMan won’t be done until 2021, but in the meantime, the cadaver injury data can be used to create a transfer function, a sort of auto-translate program for the Hybrid III.
By now the cadavers have been coaxed into a straight-backed dinner-table posture, some duct tape keeping them from slumping. (In coming months, data will be gathered for more realistic positions—legs stretched out in front or angled back under the seat.) A bioengineer holds one of the heads in his hands, like a man in a movie preparing to kiss his co-star. Another strings thin wires to hold the head in that eyes-right position, though not so firmly that it interferes with its movements, which will be captured on video cameras set up in bunkers on all four sides. There’s a protocol for everything: the angle of the cadavers’ knees, the position of their hands on their thighs, the newtons of force with which their boots are laced.
The bucolic calm of the setting belies the pressure everyone’s under to get the bodies prepped on schedule. A butterfly lands, unnoticed, on a bioengineer’s shoulder. Jays converse, or seem to, with the scratchy calls of duct tape being pulled from the roll. The hover and fuss of the scientists exaggerates the abiding stillness of the bodies. They’re like anchormen sitting for their makeup. How nice for them to be outdoors on this fine, crisp autumn day, I find myself thinking. How nice to be in the company of people who appreciate what they’ve agreed to do, this strange job that only they, as dead people, are qualified to do. To feel no pain, to accept broken bones without care or consequence, is a kind of superpower. The form-fitting Lycra costumes, it occurs to me, are utterly appropriate.
Not everyone feels the way I do. In 2007, someone at the Pentagon complained to the Secretary of the Army about a preliminary WIAMan test. “I’ll never forget,” says Randy Coates, WIAMan’s project director until his retirement in 2015. “It was a Wednesday evening, about seven o’clock. I got a call from a colonel over at Aberdeen, where we were going to run the test. He says, ‘The Secretary of the Army has shut down the test.’ We had three cadavers and a team of people who’d been working on them around the clock for days.” As Brockhoff recalls it, “Someone felt their personal beliefs had been affronted.” Her boss went to the Secretary and tried to explain: You can’t build a human surrogate without understanding how the human responds. And then he got mad. To shut down the project at the last moment like that would be not only an extravagant waste of money but a waste of the donors’ bodies. Sometime on Friday, the last possible day before decomposition would have invalidated the results, the test was cleared to go forward—surely the first cadaveric research venture with multiple two- and three-star generals in attendance.
Jason Tice, who oversees WIAMan live-fire testing, pointed out that the sudden, intense scrutiny may have had a silver lining. “It’s been informing leadership about the risks they’re subjecting soldiers to.” In other words, my words, maybe they’ll worry a little less about the dead and a little more about the living.
The downside to the Pentagonal hullabaloo is a newly bloated approval process. The protocol for research involving cadavers has to be approved by the head of the Army Research Laboratory and by ARL’s overseeing organization, the Research, Development and Engineering Command. From there it goes to the commanding general of the Army Medical Research and Materiel Command, which in turn passes it on to the Surgeon General of the Army, who sends it to Congress. Who have two weeks to respond. And if no one along the way takes issue, then and only then can the work begin. The whole process can take as much as six months.
The other fallout is a newly drafted “sensitive use” policy. Potential body donors are required to have given specific consent for research or testing that may involve, as the document lays it out, “impacts, blasts, ballistics testing, crash testing and other destructive forces.”
Who would sign such a thing? Plenty of people. Sometimes, Coates says, it’s people who like the idea of doing something to help keep military personnel safe. It’s a way of serving your country without actually enlisting. I can imagine there are people who, while drawn to the nobility of risking life and limb for a greater cause, would prefer to do so while already dead. Mostly, I’m guessing, it’s the same sorts of people who donate their remains for any other worthy endeavor that relies on the contributions of the insensate. If you’re fine with a medical student dissecting every inch of you to learn anatomy, or with a surgeon practicing a new procedure or trying out a new device on you, then you are probably fine riding the blast rig. I won’t be needing it, is the typical donor attitude toward his or her remains. Do what you have to do to make good from it.
IN WORLD War II they called it deck-slap. Explosions from u
nderwater mines and torpedoes would propel a ship’s decks upward, smashing sailors’ heel bones. Like “combat fatigue” for post-traumatic stress disorder, it was a cavalier toss-off of a name for what would often turn out to be a life-altering condition. The calcaneus (the heel) is tough to break, tougher still to repair. By one early paper’s count, eighty-four different approaches had been tried and discussed in medical journals. Dressings of lint and cottage cheese. “Benign neglect.” “Mallet strikes to break up fracture fragments” followed by “manual molding” to recreate a heel-like shape. Few statistics from the era exist, but one paper cites an amputation rate of 25 percent.
Underbody blasts have brought heels back to the attention of military surgeons. The mallets and lint have been replaced with surgery and pins, but the amputation rate for deck-slap injuries is higher than ever—45 percent, in one recent review of forty cases. Part of the problem has to do with fat, not bone. The calcaneal fat pad keeps the bone from abrading the skin on the underside of the heel. It’s an extremely dense, fibrous fat found nowhere else in the body. (There’s enough squish there to merit the cobbler’s term “breast of the heel.”) Fat pads are frequently damaged in underbody blasts, sometimes badly enough that they have to be removed. Without the padding, the pain of walking is acute. When vitamin A poisoning caused the soles of Antarctic explorer Douglas Mawson’s feet to slough off, he stuffed them in the bottom of his boots like Dr. Scholl’s cushioning insoles. It was the only way he could go on.
Can’t something be put in to replace a damaged fat pad? I spoke to orthopedic surgeon Kyle Potter, who works with these patients at Walter Reed National Military Medical Center. “You mean like a small silicone breast implant?” I wasn’t actually thinking that, but sure.
“No.” Potter pointed out that breast implants aren’t designed to stand up to the forces of heel strike. Walking pounds the calcaneus with 200 percent of a person’s body weight; running, as much as 400 percent. Rupture and leakage would likely be issues. At best, Potter said, it would feel very strange. It would feel like someone stuck a breast implant in your shoe. And who, other than Douglas Mawson, would want that?
In half an hour, some deck-slap will be broadcast live on the video monitors in the bunker. We’re all over there now, while the explosives team readies the bomb. There’s not much else in here. Some microwave ovens for warming engineered soil (“DIRT ONLY,” they are labeled). An earplug dispenser by the door. The plugs are pastel foam, shot through with sparkles. It seems like a lot of manufacturing bother just to be able to call your product Spark Plugs. A wall clock shows the wrong time. “No one can figure out the admin system for the clocks,” a man explains. “We can’t spring forward and fall back.”
We stand and stare at the video feed. A slight breeze moves the trees beyond the tower. Someone with a working timepiece begins a countdown. The explosion sounds muffled, less by earplugs than by distance. We’re a half-mile away. The cadavers appear to be thrown by the blast, but not in an action-movie way. More of a took-a-speed-bump-too-fast way. As with an automotive “crash test,” the language is more disturbing than the actual event. The cadavers in an underbody blast test are blown up, as in upward, not apart.
The event is filmed at 10,000 frames per second. Playing back the footage at 15 or 30 frames per second allows the researchers to step inside the half-second lifespan of the event. Now we can see what in real time we could not. First the boots flatten, their sides bulging noticeably. An index finger rises from where it was resting on a thigh, as though the cadaver were about to make a point. The lower legs extend and rise. The head comes down and the arms shoot out in the manner of a hurdler mid-leap. Coates reverses the footage and directs me to watch the spine. As the energy of the blast moves to the seat pan, the dead man’s pelvis rises, shortening his torso and expanding his paunch. Underbody blast can compress a seated soldier’s spine by as much as two inches. Back pain and injuries, no surprise here, are common.
Played at this speed (and in this outfit), it’s modern dance. There’s grace and beauty to the limbs’ extensions, nothing brutish or violent. In real time, though, the forces that move the limbs pass too quickly for the tissue to accommodate. Muscles strain, ligaments tear, bones may break. Imagine pulling apart a wad of Silly Putty. Pull slowly, and it will stretch across the room. Yank it fast and it snaps in two. Likewise, different types of body tissue have different strain rates. For the forces of any given blast, one type may stretch, say, a fifth of its length without tearing, while another may manage just 5 percent. WIAMan will be calibrated to reflect these differences and predict the consequences.
The long-term quality of a soldier or Marine’s life is a relatively new consideration. In the past, military decision makers have concerned themselves more with go/no-go: Do the injuries keep a soldier from completing her mission? Have we lost another pawn in the game? WIAMan will answer that question, but it will answer others, too. Is this soldier likely to have back pain for the rest of his life? Will he limp? Will his heel hurt so much that he’d rather lose the foot? The answers may or may not affect the decisions that are made, but at least they’ll be part of the equation for those inclined to do the math.
BACK IN Building 336, I ask my hosts if it would be okay to try driving a Stryker. It would not. Like an obliging parent, Mark allows me to sit in the driver’s seat and turn the steering wheel back and forth. While everything else within reach seems robustly military-grade, all toggle switches and steel, the steering wheel appears to have been salvaged from a 1990s budget rental car. (And possibly was: General Dynamics, manufacturer of the Stryker, owns Chevrolet.)
Mark ousts me from the driver’s seat so he can repark the vehicle. Brockhoff, pacing at the edge of the parking lot, has found some sort of plastic packing material. She darts over to the Stryker and stuffs it in behind the backmost tire. What follows is a noise you will find nowhere in the publications of military hearing professionals: a 40,000-pound Stryker backing up over an armload of wadded-up bubble wrap.
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* I emailed Vandue Corp, one of the companies that sell full-body Lycra suits, to see if they were aware of having tapped the cadaver apparel market. The customer care person replied that they were not. Though word had reached them that their product had caught on with bank robbers, as the face is covered but allows the wearer (if living) to see out. Presumably the felon, unlike the Halloween revelers and sports fans who more routinely don Lycra suits, wore some clothing over his. Though I hope not. And I further hope he selected the Sock Monkey pattern.
† Sleeping subway riders, conversely, look exactly like dead men—a fact born out by the regular appearance of news items about commuters who quietly die and then sit, slumped and unnoticed, through several round-trip circuits of the route. As a passenger quoted in “Corpse Rode the No. 1 Train for Hours” attests, “He just looked like he was asleep.”
Fighting by Ear
The conundrum of military noise
THE UNITED STATES MARINE Corps buys a lot of earplugs. You find them all around Camp Pendleton: under the bleachers at the firing range, in the bottoms of washing machines. They are effective, and cheap as bullets* (which also turn up in the washing machines). For decades, earplugs and other passive hearing protection have been the main ammunition of military hearing conservation programs. There are those who would like this to change, who believe that the cost can be a great deal higher. That an earplug can be as lethal as a bullet.
Most earplugs reduce noise by 30-some decibels. This is helpful with a steady, grinding background din—a Bradley Fighting Vehicle clattering over asphalt (130 decibels), or the thrum of a Black Hawk helicopter (106 decibels). Thirty decibels is more significant than it sounds. Every 3-decibel increase in a loud noise cuts in half the amount of time one can be exposed without risking hearing damage. An unprotected human ear can spend eight hours a day exposed to 85 decibels (freeway noise, crowded restaurant) without incurring a hearing loss. At 115 decibels (chainsaw
, mosh pit), safe exposure time falls to half a minute. The 187-decibel boom of an AT4 anti-tank weapon lasts a second, but even that ultrabrief exposure would, to an unprotected ear, mean a permanent downtick in hearing.
Earplugs are less helpful when the sounds they’re dampening include a human voice yelling to get down, say, or the charging handle of an opponent’s rifle. A soldier with an average hearing loss of 30 decibels may need a waiver to go back out and do his job; depending on what that job is, he may be a danger to himself and his unit. “What are we doing when we give them a pair of foam earplugs?” says Eric Fallon, who runs a training simulation for military audiologists a few times a year at Camp Pendleton. “We’re degrading their hearing to the point where, if this were a natural hearing loss, we’d be questioning whether they’re still deployable. If that’s not insanity, I don’t know what is.”
Fallon is lecturing in a classroom at the moment, but after lunch the audiologists in attendance will experience some live-fire simulated combat. Working with the Department of Defense Hearing Center of Excellence, Fallon contracted a company, ArmorCorps, who in turn brought in a team of Marine Corps Special Operations forces, and together they’ve set up a half day of warfare scenarios. The aim being to provide the hearing professionals with a firsthand feel for the frustrations and dangers of the current approach, with the hope that they’ll become advocates for something better.