Regarding the letter about the heating concern in your LP/OP, don’t forget that any heat source will cause the position to show up on IR or thermal scopes. For that reason, insulation (PAC boots and layers of coats, sweaters, and long johns) is better than heat sources. If you must use a heat source, string a thermally-reflective tarp over your position and camouflage it with snow. In essence you create a snow cave with the front open. While it will still show on IR, it won’t be human-shaped. Snow is extremely good as an insulator and as such masks heat sources. Don’t forget a scrap of closed-cell foam to sit on, if you don’t have a stool and carpet scraps to stand on. – H.D.