Sikorsky MH-53M Pave Low IV

The MH-53M is the last version of the H-53 Super Jolly Green Giant that was developed during the Vietnam War. The H-53 was designed by Sikorsky to meet an Air Force requirement for a long range Combat Search and Rescue helicopter to supplement the HH-3 Jolly Green Giant. Based on the CH-53A Sea Stallion the HH-53B entered service in 1967 quickly followed by the HH-53C. The Air Force was very happy with the performance of the helicopter both in the search and rescue roll and as a transport for Special Forces troops. The only drawback of the helicopter was a lack of all-weather and night capability. To address this the HH-53s were modified under a program called "Pave Low" with night vision equipment and other sensors. The upgraded helicopters were redesignated as MH-53H. The final upgrade came with the MH-53M Pave Low IV wich gave the helicopters even more capabilities with onboard mission planning computers and satellite communications allowing replanning of routs and missions while airborne.