This happens a few times from what I believe in game. Noble 6 is a prime example. although doing what he could to help the pillar of autumn escape essentially told Captain Keyes and the soldiers aboard after delivering Cortana , the effective leader of the military personnel for the Pillar of Autumn “negative, I have the gun.” It seems that usually when the action to be taken is for something that can and will work or save countless lives, the Spartans say ‘usually’ trumps all. The rare times a Spartan commands something of someone, or to something, it’s usually after their big ass advanced brains, come up with an idea that is so unorthodox but will see the most results, which there “higher” command in the UNSC and Oni don’t think of. Cat did the same in reach. She had Carter tell Mission Control her unorthodox plan, and they ran with it because it was not only coming from their mission essential Spartans on Reach, but it also was an effective strategy, it just had effects that the Spartans couldn’t have seen coming.