CAMP LEATHERNECK, Afghanistan – When it comes to morale on a forward operating base, creature comforts are no small thing. I saw that firsthand two years ago here on my way to and from an embed in Marjah district. There was only one small PX store on Camp Leatherneck in a tent, and it could take an hour to get through the line for the register. Popular items ranging from T-shirts to energy drinks frequently were out of stock. The solution? On Nov. 15, the base opened a new PX with a 6,900 square-foot sales floor. To say it is…