A Defense Department spokesman briefed reporters.一位国防部发言人向记者们简要介绍了情况。The Defense Department is one of Lockheed's biggest regular customers.国防部是洛克希德公司最大的固定客户之一。The Internet itself is an outgrowth of a computer network in the US Defense Department.因特网本身是美国国防部计算机网络的产物。