Ключевые слова: alertness, army, combat, combat zone, communication, conflict, defense, distance, dust, duty, environment, equipment, frontline, ground, heavy machinery, hills, hobbies, hostilities, landscape, maneuver, military, mission, movement, nation, nature, observation, occupation, operation, operations, patrol, peace, preservation, protection, resilience, risk, security, soldier, strategy, structure, tank, technology, tension, terrain, troops, vehicle, vigilance, war, weaponry,