Era
20th century
27
World War, 1939-1945
20
19th century
7
Korean War, 1950-1953
7
21st century
5
Persian Gulf War, 1991
3
Vietnam War, 1961-1975
3
18th century
2
1945-1955
2
Iraq War, 2003-2011
2
Japanese occupation, 1942-1945
2
Revolution, 1775-1783
2
War of 1812
2
World War, 1914-1918
2
1783-1815
1
1783-1865
1
1914-1994
1
1945-1975
1
1991-
1
2001-
1
Civil War, 1861-1865
1