Category:War

Library of Congress Classification Dewey Decimal Classification Wikipedia has a category War, which it categorizes in Military
 * main class U -- Military Science
 * main class V -- Naval Science
 * “Thousand Sections” subclasses of “Hundred Divisions” subclass 350 Public administration and military science, of main class 300 Social sciences

categorization note
 * LOC classifies this under the hierarchically broader term International relations