The simplest would be to make sure the addresses are not announced by the DoD, which depending on the thinks they want to test could matter, or could be irrelevant.

If other scammers are using spoofing the ranges then another company does it, that doesn't raise alarm in the other entities abusing the same trick.

If you announce it as DoD then it may scare off the others.

In any good investigation, you want to shroud the data/intel collection. Using a front company, or series of levels of fronts, is the way you have to go about it.

In short, a honeypot.