Huey gunships - getting out of the revetment to the runway with a fully loaded aircraft was an exercise in patience. Lift to the hover, taxi, on reaching full left pedal due Nr bleed close throttle and perform hovering auto, wind throttle back on, repeat. At times both backseaters would run along side during take off until reaching translational and then clamber on board. Replacement of the -11 engine with the -13 relegated the procedure to history, though that only happened in our unit shortly before we pulled out.