Watch: Arjun Mk-1A, One Of World's Most Advanced Tanks, In Action Watch: Arjun Mk-1A, One Of World's Most Advanced Tanks, In Action The improvements, 71 in all, make this variant of the Arjun, which first entered service in 2004, an altogether different beast from the 124 Arjun Mk-1 tanks deployed by two armoured regiments of the Indian Army. At the moment, the Arjun Mk-1A carries a total of 39 rounds of different types of ammunition New Delhi: The Defence Acquisition Committee of the Defence Ministry on Tuesday granted an 'Acceptance of Necessity', paving the way for the Army to acquire 118 Arjun Mk-1A tanks in a deal worth Rs 8,400 crore. The final step before an order is placed is a meeting of the Cabinet Committee of Security which is yet to be scheduled.