Pretty much a license to cover up anything commanders interpret as embarrassing. There's a lot of wiggle room here. From FM 3-61:
"1-44. Lapses of ethical judgment often become controversial media topics, garner negative publicity, and significantly damage reputations and credibility. As a result, these lapses potentially result in the loss of trust. Adversaries may exploit and magnify any loss of discipline by Soldiers through propaganda and the media. Such negative publicity damages the Army’s reputation; adhering to the tenets of PA can minimize the effects of negative publicity and maintain public trust and confidence in the Army."