ASADABAD, Afghanistan — The nurse looked at Spc. Adrian Danczyk in disbelief when he finally made it to the aid station after a firefight. Second Lt. John Bradley wears the Army’s Advanced Combat Helmet, which is lighter and stronger than the old helmets, while in Iraq. “The medics were working on the guys who were hurt the worst, and I was just sort of sitting back out of the way,” said Danczyk, Company D, 1st Battalion, 505th Parachute Infantry Regiment, 82nd Airborne Division. Lt. Col. Chuck Williams, commander of 1st Squadron, 1st Cavalry Regiment of the 1st Armored Division, wears...