1861-1865 1939-1945 19thcentury aerial aerialoperations airdefenses armoredtroops armoredvehicles army asia bombing campaigns civilization combatsurvivability(militaryengineering) commandoftroops confederatestatesofamerica drillandminortactics generals german greatbritain history india infantry japan junglewarfare military militaryartandscience militarymaneuvers militaryplanning militaryresearch pacificarea planning strategy tactics tankwarfare unitedstates unitedstatescivilwar warinliterature weaponssystems worldwar