RB

You can receive a purple heart for injuries sustained through friendly fire.

"Since then, over 800,000 Purple Heart medals have been awarded, some in formal ceremonies, others as intimate as a medal pinned to a hospital gown. The qualifications have expanded during that time as well, to include injuries to servicemen and women from terrorist attacks, friendly fire and from being part of a peacekeeping force."

http://www.npr.org/programs/morning/features/patc/purpleheart/

Hey Bob Dole recived a purple heart in WWII for his grenade bouncing off a tree