ATK [ATK] will develop the largest diameter composite-cased solid rocket motors the company has ever assembled for Stratolaunch Systems’ Air Launch Vehicle (ALV), according to a company executive. ATK said Tuesday it was awarded a contract from Orbital Sciences [ORB], the integrator of Stratolaunch’s ALV, to provide first and second stage propulsion as part of a revolutionary air-launched space transportation system. The contract includes the design, development and flight hardware for the initial Stratolaunch missions. Normal 0 false false false…