Air Force was last ranked in 2010, up to #24 for 2 weeks mid season
Navy was last ranked in 2004, finishing #24
Army was last ranked in 1996, finishing #25
Air Force got as high as #2 in 1985 and then lost to BYU in the 2nd to last game the season and was kept out of the national championship. They went on to stomp tu in the Bluebonnet bowl.