- After retiring from the Air Force, Mark moved to Colorado to become a wilderness horseback outfitter and rancher.
- Mark was a combat rescue helicopter pilot for much of his Air Force career. He flew the CH/HH-3E "Jolly Green Giant" while stationed in the Philippines and in New Mexico, and the MH/HH-60G "PaveHawk" while stationed in New Mexico, South Korea, and Okinawa.
- Mark and his wife, Sharon, owned 51 different horses, with as many as 45 at one time. For a while, they bred and raised Friesian Sport Horses.
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