 Complete the following phrase:  Such an act can be survivable: in World War II, U.S. Marine Jack Lucas, in the Battle of Iwo Jima, placed two grenades under his steel M1 helmet and himself before they exploded. Lucas lived, but spent the rest of his life with over 200 pieces of shrapnel in his body. In 2008 near Sangin in Afghanistan, British Royal Marine Matthew Croucher used his rucksack to pin the grenade to the floor; his body armor absorbed the majority of the blast. On November 21, 2010 in Marjah, Helmand Province, Afghanistan in support of 