The Gyrodyne DASH (Drone Anti-Submarine Helicopter) was a drone helicopter part of the US Navy Fleet Rehabilitation and Modernization (FRAM) program. Instead of building new frigates, the FRAM upgrade allowed World War II-era destroyers, which had little room for a new flight deck, to remain useful in modern naval warfare adding to them a stand-off weapon to attack out to the edge of the sonars range. the QH-50 was retired by the US Navy frontline ships in 1969 and a handful of QH-50Ds ramain with the US Army for testing/ drone use at White Sands until 1997. The shipborne variant remain in Japanese Maritime Self-Defense Force service until 1977
