First United States Army was created in 1918.
First Canadian Army was created in 1942.
First Army - Romania - was created in 1916.
First Army - Australia - was created in 1939.
First Army - Greece - was created in 1951.
Japanese First Army was created in 1937.
United States Army was created in 1775.
Japanese First Area Army was created in 1942.
First Allied Airborne Army was created in 1944.
Forty-First Army - Japan - was created in 1944.
First General Army - Japan - was created in 1945.
Thirty-First Army - Japan - was created in 1944.
Fifteenth United States Army was created in 1944.