So technicaly, the breakdown would be:
1900 - 1914 - Early Aviation
1915 - 1918 - WWI
1919 - 1939 - Interim Aviation
1939 - 1945 - WWII
1946 - 1949 - Post War
1950 - 1953 - Korean War
1954 - 1964 - Cold War
1965 - 1973 - Vietnam War
1974 - 1989 - (Post Vietnam?)
1990 - Gulfwar to present?