Do-it-yourself battlefield medicine saves lives (AP)

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In this July 19, 2011 file photo, Sgt. 1st Class Leroy Arthur Petry talks about his prosthetic hand at a news conference at Joint Base Lewis McChord, Wash. Petry, who recently received the Medal of Honor for bravery in Afghanistan, lost his right hand when attempting to throw back an enemy grenade aimed at his group. He self-administered first-aid that saved his life, part of a major shift in managing war wounds that new research shows has had success in the Army's major raid force. (AP Photo/Elaine Thompson, File)AP – When Army Ranger Leroy Petry’s hand was blown off by a grenade as he was saving his comrades in battle, he knew just what to do. He used his remaining hand to twist a tourniquet around his arm to avoid bleeding to death.

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