HJL,
Regarding the letter about the heating concern in your LP/OP [1], don’t forget that any heat source will cause the position to show up on IR [2] 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.