If you think the Marine Corps Marathon is tough, try kicking up clouds of sand as you run 3,000 feet above sea level. That’s exactly what Maj. Lauren Edwards, who is assigned to Combat Logistics Regiment 2 at Camp Leatherneck, Afghanistan, and her fellow All-Marine Running Teammate, 1st Lt. Erin Demchko, have been training to do. After months of grueling training, Demchko returned to the U.S. last month, but Edwards remained behind working with Brigade headquarters Group, 5th Battalion, 10th Marines to receive approval for a satellite Marine Corps Marathon at Camp Leatherneck. Looks like her wish was granted. From…