The US military on Wednesday made a major announcement wherein it said to ground all of its Osprey V-22 helicopters. The latest development came just a week after eight Air Force Special Operations Command service members died in a crash off the coast of Japan.The US military on Wednesday made a major announcement wherein it said to ground all of its Osprey V-22 helicopters. The latest development came just a week after eight Air Force Special Operations Command service members died in a crash off the coast of Japan.