airfields ashore. It replaced the Marine Corps' CH-46E and CH-53D fleets. CMV-22B U.S. Navy variant for the carrier onboard delivery role. Similar to the MV-22B but includes an extended-range fuel system, a high-frequency radio, and a public address system. EV-22 Proposed airborne early warning and control variant. The Royal Navy studied this variant as a replacement for its current fleet of carrier-based Sea King ASaC.7 helicopters. HV-22 The U.S. Navy considered an HV-22 to provide combat search and rescue, delivery and retrieval of special warfare teams along with fleet logistic support transport. It chose the MH-60S for this role in 2001. SV-22 Proposed anti-submarine warfare variant. The U.S. Navy studied the SV-22 in the 1980s to replace S-3 and SH-2 aircraft. Operators Japan Self-Defense Forces (2 delivered, 3 on order, plans for 12 more) United States Air Force 7th Special Operations Squadron 8th Special Operations Squadron 20th Special Operations Squadron 21st Special Operations Squadron 71st Special Operations Squadron 418th Flight Test Squadron United States Marine Corps HMX-1 VMX-22 VMM-161 VMM-162 VMM-163 VMM-165 VMM-166 VMMT-204 VMM-261 VMM-263 VMM-264 VMM-266 VMM-362 VMM-363 VMM-365 VMM-561 United States Navy – 44 CMV-22Bs on order, with deliveries to start in 2020. HX-21 VRM-30 Accidents The V-22 Osprey has had 13 hull-loss accidents with a total of 51 fatalities. During testing from 1991 to 2000, there were four crashes resulting in 30 fatalities. Since becoming operational in 2007, the V-22 has had eight crashes resulting in 16 fatalities and several minor incidents. The aircraft's accident history has generated some controversy over its perceived safety issues. Aircraft on display 163911 – V-22A on display at the Aviation Memorial at Marine Corps Air Station New River in Jacksonville, North Carolina. 163913 – V-22A on display at the American Helicopter Museum & Education Center in West Chester, Pennsylvania. 99-0021 (formerly 164939) – CV-22B on display at the National Museum of the United States Air Force at Wright-Patterson AFB in Dayton, Ohio. 164940 – MV-22B on display at the Patuxent River Naval Air Museum in Lexington Park, Maryland. Specifications (MV-22B) Notable appearances in media See also References Bibliography Markman, Steve and Bill Holder. "Bell/Boeing V-22 Osprey Tilt-Engine VTOL Transport (U.S.A.)". Straight Up: A History of Vertical Flight. Atglen, Pennsylvania: Schiffer Publishing, 2000. . Norton, Bill. Bell Boeing V-22 Osprey, Tiltrotor Tactical Transport. Earl Shilton, Leicester, UK: Midland Publishing, 2004. . O'Hanlon, Michael E. Defense Policy Choices for the Bush Administration.