South Carolina Gov. Mark Sanford is a captain in the Air Force Reserve, where adultery is considered a crime. Punishments range from from a commander’s letter of reprimand, which could have ended his career in the service, to forfeiture of pay.

Sanford’s command office considered disciplining Sanford after he publicly confessed to adultery in June but decided against it, according to The Greenville News:

Cliff Tyler, spokesman for headquarters of the Air Force Reserve Command at Robins Air Force Base in Georgia, said, “They looked at all the facts and they looked at the circumstances and the decision was made as a command not to take any action against him.”

173 members of the Air Force faced nonjudicial punishment for adultery last year. But one military lawyer said Sanford’s case is different because a spouse wasn’t complaining and the adultery didn’t involve another member of the military. Another military lawyer explained that  military law applies to active members, so pinning punishment on a reservist is difficult:

[P]art of the requirement for prosecution is that the affair “was to the prejudice of good order and discipline in the armed forces,” Tully said, meaning that it affected morale of the unit or brought discredit to the military.