To the LimitBy: Tom A. Johnson The riveting memoir of a Vietnam War helicopter pilot. When you step into a Huey with Tom Johnson, youre in for the real thing. No one has previously captured the Vietnam helicopter experience with such gripping authority.Robert F. Dorr, author of Chopper From June 1967 to June 1968, Tom Johnson accumulated an astonishing 1,600 flying hours piloting the UH 1 Iroquoisbetter known as the Hueyas part of the famous First Air Cavalry