U.S –  The U.S. has adopted a unique Israeli battlefield tactic in its fight against ISIS: exploding a missile above a building to warn civilians inside that it’s about to be bombed.

Israeli forces have widely used the so-called knock-on-the-roof operations in Gaza attacks in recent years to try to get civilians out before they are hit. The first public revelation of the U.S. using a “knock operation” came Tuesday at a press briefing by Air Force Maj. Gen. Peter E. Gersten, deputy commander for operations and intelligence for the anti-ISIS Operation Inherent Resolve. Gersten described a strike against an ISIS financial storage center on April 5 in southern Mosul, Iraq. The U.S. had been closely watching the house of an ISIS finance operative, or “finance emir” in the words of Gersten. “He was the major distributor of funds to Daesh fighters,” Gersten said, using another name for ISIS.(CNN.COM/photo: static-secure.guim.co.uk)…[+]