The Bell 406 resulted from the US Army Helicopter Improvement Program (AHIP). Airframes received a upgraded transmission and engine, a four-bladed main rotor and the distinctive Mast-Mounted Sight (MMS) above the rotor system.
The Kiowa Warrior distinguishes from the original AHIP model when carries the weapons pylon mounted on both sides of the aircraft
US Army OH-58D Kiowa Warrior Final Flight, 19-Sep-17 : The US Army Aviation Development Directorate flew the Army’s final OH-58D Kiowa Warrior flight from Felker Army Airfield at Joint Base Langley-Eustis on September 19, 2017
Last OH-58D Kiowa Aviator class to graduate, 25-Aug-14 : FORT RUCKER, Alabama By Nathan Pfau - A legacy decades in the making is coming to an end, as eight students from Fort Rucker's last OH-58D Kiowa Warrior class prepare to graduate.