The Ling-Temco-Vought XQM-93 was a remotely piloted aircraft developed in the United States in the late 1960s and early 1970s for use as a communications relay in the Vietnam War.

In the late 1960s, following the early microwave HALE (High Altitude Long Endurance) vehicle studies, the US Air Force worked with LTV Electrosystems (later E-Systems) under the Compass Dwell program to build an unmanned aerial vehicle (UAV) using much more conventional turboprop propulsion.

Igloo White involved seeding the region with thousands of seismic and acoustic sensors, most of them air-dropped, which would pick up indications of traffic along the trail and report them back to a central command center in Thailand, which would dispatch air strikes in response.

The sensors were battery-operated and had limited range, so airborne radio relay aircraft orbited above the battle area to pick up the signals and pass them on to the command center.

They were replaced by Beech Debonaire single-engine light aircraft, modified for the radio relay role and given the military designation of QU-22A.