Citations:frat

(military, slang) Fratricide; friendly fire

 * [2003, Bill Katovsky, William Katovsky, Timothy Carlson, Embedded: The Media at War in Iraq, Globe Pequot
 * I was not present when Americans died at the hands of fellow soldiers in what the military calls &quot;frat,&quot; for fratricide. I had no idea what ordinary Iraqis were experiencing.]
 * 2007, Jonathan Dowty, Christian Fighter Pilot Is Not an Oxymoron, Jonathan Dowty (ISBN 9780615144535), page 24:
 * [If he] drops a simulated bomb on a friendly ground position, he is required to buy a keg as punishment for the fratricide or frat. (This is in addition to the humiliation of the debrief, as fighter pilots consider frat the gravest of sins.)