Question: how do you join the us coast guard?
Answer: Be a U.S. citizen or nationalized to be a Coast Guard officer.
To enlist, you must be a U.S. citizen or a resident alien.
Be between the ages of 17-27. ... 
Have a high school diploma.
Have no more than two dependents.
Take and pass the Armed Services Vocational Aptitude Battery (ASVAB) test.