This site contains a comprehensive list of U.S. military terms and definitions.
Z Zulu Time (Greenwich Mean Time) ZBB Zero-Based Budget ZF Zone of Fire ZG Zero Gravity ZI Zone of the Interior ZICON (1) Zone of the Interior Consumers’ Network; (2) Zone of Interior Communication Network ZOS Zone of Separation ZPU Soviet (FSU) Antiaircraft Machinegun ZSU Soviet (FSU) Self-Propelled Antiaircraft Gun ZU Soviet (FSU) Towed Antiaircraft Gun ZULU Greenwich Mean Time