They aren't called Task Force Bayonet for naught. They are the spear - the fodder, if you will.
They need a break and/or some extra boots
Yeah, both -- pull out of the line, re-equip, rest, retrain, and reinforce, all in-country. Ready to go back later overstrength, but all veterans.
Like the British army used to do, 200 years ago -- senior regiments like the Queen's Own and the Blues filling gaps from junior regiments of foot numbered in the teens and twenties, those regiments' officers then going to the bases of the regiments numbered in the twenties and thirties and on down the line, so that e.g. the 93rd Foot was a depot regiment -- recruit some men, watch them march away to the junior regiments that had been picked over by senior line regiments.
No boot recruits in the mountains (MHO) except in the lightest units, let them break in at some other base area. MHO.