The OH-58D, the most recent variant, is powered by a Rolls-Royce T703-AD-700A or 250-C30R/3 turboshaft engine, which gives it a top speed of 149 mph. It needs a crew of two and can carry five additional passengers. For combat, the Kiowa can be armed with AGM-114 Hellfire anti-tank missiles, Hydra 70 rockets, an M296 or M3P machine gun, and/or AIM-92 Stinger missiles.