 Complete the following phrase:  Upon fielding the Apache, capabilities such as the FLIRs use in extensive night operations made it clear that it was capable of operating beyond the forward line of own troops FLOT to which previous attack helicopters were normally restricted. It was discovered that the Apache was coincidentally fitted with the Have Quick UHF radio system used by the U.S. Air Force, allowing inter-service coordination and joint operations such as the joint air attack teams JAAT. The Apache have operated extensively with close air support CAS aircraft, such as the USAFs Fairchild Republic A-10 Thunderbolt II and the USMCs McDonnell Douglas AV-8B Harrier II, often acting as a target designator to conserve the Apaches own munitions. The Apache was first used in combat in 1989, during 