 The weapons were stored in an interchangeable pod in the internal weapons bay, allowing for ease of re-arming and switching from missiles to other kinds of weapons.Only the Mark 1 model (with lower-powered American engines) flew, including one that reached Mach 1.98.A total of five Mark 1 aircraft were completed with several of the 29 Mark 2 models (with more powerful Iroquois engines) on the production line nearing completion.