The Griffon replaced the Kiowa, Single Huey and the Twin Huey. The CH-47 was, iirc, gone prior to the buy.
The Kiowa was a scout helicopter. Typical tasks included FAC, Recce, RRB, FOO, MFCO, Liason, and Airmobile support. These taskings required low altitude flight (app 3 feet agl) as well as...