Pratt & Whitney Rocketdyne completed its purchase of a supplier of propellant tanks and pressure vessels for the space and missile industry. The terms of the deal between Canoga Park-based Pratt & Whitney and ARDE Inc., of New Jersey, were not disclosed. The acquisition of ARDE will help in Pratt & Whitney’s growth to provide propulsion systems for the commercial, military and civilian space market. Kirk Sneddon has been named general manager of ARDE and will be responsible for the integration of ARDE systems into the Pratt & Whitney Rocketdyne organization. ARDE is a major supplier of tanks and pressure vessels to Pratt & Whitney Rocketdyne products.