There are a host of enablers that are not part of the Combat Team, Battle Group or even the Brigade Group. That does not mean that we should not be prepared to employ them properly and that our commanders and troops should not be trained in their use. And we may not be able to get them all the time, or even most of the time and perhaps just a tiny bit of the time, but if our world is going pear-shaped, no telling what will show up to join the fight.
This is getting well off the subject, but a line I have used in the past when discussing artillery in battle was extrapolated from a passage LGen Sir Brian Horrocks, the GOC-inC of 30 BR Corps in NWE, wrote in one of his books. He commented on sitting on a hill in NWE with his corps artillery commander, who had 1000 guns on call no farther away than the end of his radio antenna.
I would pause and then add, "and what was important is that so did all the FOOs in his corps, and they weren't afraid to call for them." Different war, and different circumstances, but the principle still applies, and not just with guns.