At 6 feet, 6 inches tall and 305 pounds, Air Force 2nd Lt. Ben Garland looks more like a football player than a typical officer.

That’s because he's a defensive lineman contracted to play for the NFL’s Denver Broncos. Garland will attend the team's conditioning and tryout camps which last through mid-June.

The 23-year-old Air Force Academy graduate has been approved to be released from active ...