text: branch to branch? simple q.  if i was in the air force for 4 years, and then decided to get out, is it at all possible to join the navy or army after that? it depends.  your dd form 214 needs to have the right reentry codes (you will need to see the recruiter).  second, you need to be within the age limit required.  third you need to look at the pros and the cons (which means talk with the recruiter).  the navy (currently) will might give you the your air force rank if you are/were sra or below.  ssgt and above 90% chance you will start at e-3 or e-4 (which depends on your navy job you get).  the army will most likely let you keep your rank.  both navy and army will only have a real hand full of jobs (like six or less) available for you.  if you're active duty air force and have at least three years of service, and have an associates degree or at least 90 semester hours of college, you could become an officer (butter bar:) in the army.  it's call operation: blue to green.