I actually got a certification in gov contracting a number of years ago. Interesting stuff, if a bit dull.
The big failing with the ACU colors was that they completed the entire testing cycle, then decided on a color scheme that hadn’t been tested at any point during the program. At least the MARPAT colors were based on real-world testing and previous research. Ditto Multicam, which again has some actual environmental colors. The ACU is almost a literal example of “what color is the sky in your world”.
Assuming what you are saying is true about this particular program, you can't really test anymore if the DT&E and OT&E Milestones are already past. It's almost impossible, and to go back and test again would have been considered a huge failure and a threat to some government "executive's" advancement. So you see what I mean when I say the concepts of spiral development are at odds with the linear Milestones model. They should have went back and tested.
Now, years later, no one will be held responsible and they can just go through the entire process again with new taxpayer money.