WASHINGTON, July 25—Tomorrow the Army is scheduled to receive the first pre-production Stryker Mobile Gun System from prime contractor General Dynamics in Michigan. The Stryker is a key part of the Army’s effort to transform into a lighter and more agile force. Stryker is a 19-ton wheeled armored vehicle that will come in 10 different types of platforms, of which the Mobile Gun is one. General Dynamics has already delivered pre-production models of several other types of Stryker platforms. In November 2001, the Army awarded a six-year requirements contract to a joint venture between General Motors and General Dynamics...