I'm having some difficulty updating the Operation: RED FLAG article; I make a couple-thousand bytes worth of extra content before rejecting it because of its poor quality - I just can't get it into the right words.
The problem is bringing up the events that caused RED FLAG to fail:
- The loss of communication across parts of Reach and between the colonies when the Visegrad relay went down.
- The Army and Navy not working together, related to the above. This is evident in the destruction of the Long Night of Solace, a target that Admiral Stanforth would have had captured, had he been informed of Operation: UPPER CUT, or even its mere existence. He wasn't notified until several days later.
- Related to the first two, ONI appears to have collapsed on the colony - Stanforth wasn't aware that the Covenant were on Reach until at least a week after an ONI base was nearly destroyed. He was also not informed of UPPER CUT, as previously-stated, despite his established career in the organization (albeit, within Section 3).
- The majority of the Epsilon Eridani Fleet around Reach was left on one side of Reach in heavy "traffic" (that is to say, a large number of ships were clustered within a small area) while the Visegrad relay was being repaired. While it could be viewed as solely being a cover-up by Stanforth, this had been going on since it went down. As such, much of the Navy was unable to defend Reach, or even aware that it was under attack until the Fleet of Particular Justice jumped over their side of Reach on August 30.
Overall, I'd say that communications problems were the reason for the failure of RED FLAG, which only got as far as Phase 1, either because Stanforth was willing to risk lives while waiting for a supercarrier or no one informed him of what was going on in time to progress further.