Not a day passes that I don’t get at least one reader asking if active-duty military service is creditable for civilian retirement purposes and what you have to do to get that credit. These folks have come to a sympathetic audience, since I served on active duty and, after being hired by the federal government, put in a good many years in the reserves. For active-duty service to be creditable for civilian retirement purposes, you have to have served in the Army, Navy, Air Force, Marine Corps or Coast Guard. You’ll also get credit if you served as a midshipman…