1st Lt. Ross Pospisil, platoon commander, Company A, 1st Combat Engineer Battalion, skis up a mountain pass near the Marine Corps Mountain Warfare Training Center's skylift training area April 2. Pospisil conducted land navigation during the Winter Mountain Leaders Course. Graduates of the course will become Mountain Warfare Combat Instructor certified and be an assest to their commanding officer. - 1st Lt. Ross Pospisil, platoon commander, Company A, 1st Combat Engineer Battalion, skis up a mountain pass near the Marine Corps Mountain Warfare Training Center's skylift training area April 2. Pospisil conducted land navigation during the Winter Mountain Leaders Course. Graduates of the course will become Mountain Warfare Combat Instructor certified and be an assest to their commanding officer.