Please add your own, in alphabetical order.

• APPN - Appropriation Number (U.S. Military)
• ARMS - Automated Recruit Management System (U.S. Military)
• ASEAN - Association of South East Asian Nations
• AWOL - Absent Without Leave (military jargon)
• BEA - Budget Execution Authority (U.S. Navy)
• CAG - Commander, Air Group (U.S.)
• CENTCOM - United States Central Command (U.S. Military)
• CINCLANT - Commander-in-chief, Atlantic Forces (U.S.)
• CINCLANTFLT - Commander-in-chief, Atlantic Fleet (U.S. Navy)
• CINCPAC - Commander-in-chief, Pacific Forces (U.S.)
• DFAS - Defense Finance and Accounting Service (U.S. Military)
• DMZ - Demilitarized Zone
• FOD - Foreign Objects or Debris (U.S.)
• Gulag The Chief Administration of Collective Labor Camps (Russian Главное Управление Лагерей, "Glavnoye Upravleniye Lagerey")
• Interpol -- International Criminal Police Organization
• MCEN - Marine Corps Internet (U.S.)
• MiG - Mikoyan-Gurevich
• MRE - Meal Ready to Eat (U.S. Army)
• NAFTA - North American Free Trade Agreement
• NAS - Naval Air Station
• NATO - North Atlantic Treaty Organization
• NMCI - Naval Marine Corps Internet (U.S. Navy)
• O&M, MC - Operations & Maintenance, Marine Corps (U.S. Navy)
• O&M, N - Operations & Maintenance, Navy (U.S. Navy)
• PMS - Preventative Maintenance Schedule (U.S. Navy)
• PO - Post Office
• RFP - Request for Proposal (U.S.)
• SHAEF - Supreme Headquarters Allied Expeditionary Forces (historic)
• TAD - Temporary Active Duty (U.S. Military)
• TDY - Temporary Duty (U.S. Military)
• USA PATRIOT Act - Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism
• USAF - United States Air Force
• USN - United States Navy
• USO - United Service Organizations (U.S. Military)