Sergeant Moises Machuca (left), stableman with the Marine Corps Mounted Color Guard on Marine Corps Logistics Base Barstow, Calif., rides in his first big event with the MCG during the Rose Parade, Jan 1. Machuca used training with Scout Snipers to understand and learn horsemanship. - Sergeant Moises Machuca (left), stableman with the Marine Corps Mounted Color Guard on Marine Corps Logistics Base Barstow, Calif., rides in his first big event with the MCG during the Rose Parade, Jan 1. Machuca used training with Scout Snipers to understand and learn horsemanship.