問一個OSU填表application的問題

[ohhaha]

我在他的on-line application form第一頁就遇到了麻煩
有個地方說：
Were you on active military duty during the last 12 months? Yes No
If yes, dates of military service From (mm/yyyy)
To (mm/yyyy)
Branch of Service ???
Rank on Entry ???
Rank on Separation ???

請問一下我打上問號這三個東西要填什麼啊？ 麻煩知道的人告訴我好嗎？ 謝謝 感激不盡