during IED detonations. The data collected will help in the designing of improvements for the ACH's suspension and chin strap systems.

In May 2009, 55,000 of these were in storage and 44,000 were in use by U.S. Army, Navy, and Air Force personnel. The 44,000 helmets in use by service members were recalled by the U.S. Army in May 2010 due to potentially defective materials being used. Eventually, the contractor agreed to pay a $3 million fine, without admitting to any wrongdoing by