33.03 measurement and instrumentation in physics 1 33.12 acoustics 1 89.87 weapons, arms and armor 1 Abolitionists 1 Account books 1 Accounting 5 Accounts receivable 1 Administration 1 Admirals 1 Admission 1 Aerial operations 1 Aerial operations, American 1 Aerial operations, British 1 Aerodynamic characteristics 1 Aerodynamic configurations 1 Afghan War, 2001- 1 Afterburning 1 Aircraft design 1 Airplanes, Military 2 American newspapers 1 Americans 2 Ammunition 9 Amputees 2 Anemometer 1 Antietam, Battle of, Md., 1862 3 Appareils et matériel 1 Appointments and retirements 1 Appropriations and expenditures 4 Armada, 1588 1 Armament 1 Armed Forces 31 Armies 1 Armor 6 Armor-plate 3 Armored vehicles, Military 3 Armored vessels 1 Arms control 2 Arms transfers 9 Armstrong gun 3 Army of Northern Virginia 1 Army of Northern Virginia (C.S.A.) 1 Arsenals 2 Artilleri 1 Artillerie 1 Artillery 70 Artillery drill and tactics 6 Artillery operations 4 Artillery, Coast 4 Artillery, Field and mountain 12 Assassination 1 more ...