The basic problems with things like blueforce tracker is cost and like the RAF the army only has a finite budget. Its also a gadget that can go wrong so UK relied on visual recogntiton training at basic level in 03 of UK equipments chaning to Principle allies kit and possible enemeys kit and now to nothing most army personel receive no recognititon training.
The army made a point ofmaking sure all vehicles going north had thermal panels, visual v's and orange panels but from experience of myself,friends and media reports the US soldier did not have any understanding of thease.
From a communications perspective telling the Americans anything over radio was problematic as their systems and our don't net together well. I fond it easier to ring whitehall and get put through to US telephone network to speak to people on same camp.
If we were to purchase a combat tracker system would we uy our own? would it be compatible with allies systems? would they allow us band width to use it? and what happens when it goes wrong as IFF did with fatal consequences in 03?