OH-6 Cayuse (Loach)OH 6 Loach Army helicopter model. The Boeing (McDonnell Dougles) (formerly Hughes model 369) OH 6A, was designed for use as a military scout during the Vietnam war to meet the U. S. Army's need for an extremely maneuverable light observation helicopter (LOH program). The Hughes OH 6A Cayuse was quite effective when teamed with the AH 1G Cobra attack helicopter as part of what were known as "Pink Teams". The OH 6A "Loach" would find targets by flying