In World War II, the Japanese launched a series of bomb-carrying balloons to the U.S. to try to cause random damage. Many such balloons were found, some causing minor damage, except for one that killed a woman and five children who came across it during a picnic.
The government requested the press to keep quiet about any balloon incidents, so as not to give the Japanese the idea that there was any degree of success.
As it turns out this was a successful strategy–for lack of evidence of any effectiveness, the Japanese halted the program.
Today’s press is entirely different than 1945; then the government contacted newspapers and radio stations and that about covered it. Today there are countless news outlets. If there were information critical to a national security effort that the government wanted to suppress for the sake of their strategy, assuming it would actually be a good thing to do this, would it be possible?
I doubt the government could get that kind of cooperation for two reasons:
News media are now too numerous and too decentralized to expect the media to act as a unit
News is money. If the majority of outlets suppressed the information, opportunists would seize upon it as an exclusive, even if it put U.S. citizens and residents in danger.