Later development and future
Two unarmed versions, known as the General Atomics ALTUS were built, ALTUS I for the Naval Postgraduate School and ALTUS II for the NASA ERAST Project in 1997 and 1996, respectively.[23]
Based on the MQ-1 Predator, the General Atomics MQ-1C Gray Eagle was developed for the U.S. Army.
The USAF ordered a total of 259 Predators, and due to retirements and crashes the number in Air Force operation was reduced to 154 as of May 2014. Budget proposals are to retire the Predator fleet between FY 2015 and 2017 in favor of the larger MQ-9 Reaper, which has greater payload and range. The Predators would likely be stored at Davis-Monthan Air Force Base or be given to other organizations willing to take them. The Customs and Border Patrol have shown interest, but already operate higher-performance Reapers and are having difficulty with operating costs. The U.S. Coast Guard has also shown interest in land-based UAV surveillance. Foreign sales are also an option, but the MQ-1 may be subject to limitations of the Missile Technology Control Regime because it can be armed. Export markets are also limited by the Reaper as well.