RLE - of course it is perfectly feasible (and appropriate) to use contractors on deployed ops. My point is that their use is not a way to save money vice uniforms and, if things are too kinetic, they may not be there.
However small the support tails gets in relation to the teeth, there will always be a requirement to have all bases covered by an as-small-as-practical cadre of military personnel, especially at the start of an op when the metal is flying.