Someone's been reading up on Kraska's deniability scenario (PDF) and basic maskirovka.

“The Department of Defense will be reluctant to retaliate until they are certain what happened and who fired on whom, and why,” he said.

The U.S. has been beefing up naval and air power, capable of striking Iranian forces in the Persian Gulf over the last month after the White House said it had information about possible future attacks against American interests. The Pentagon would not say Thursday whether there were plans to speed the buildup.

Nader and Cancian believe it’s possible Iranian-funded Houthi rebels, who are mired in a civil war in Yemen, may be to blame. If that’s the case, “the U.S. will not want to get involved in a shooting war over Yemen,” Cancian said.

It will likely take days, weeks or even months for the military to go through the forensics needed to find out exactly who is behind the attack. But if it is determined to be Iran, Cancian believes the U.S. forces in the area will make quick work of Iran’s navy. “The U.S. has assets designed to take on Russia and China. Iran’s ships are very exposed. I’d expect the U.S. would be able to sink Iran’s navy in about two days.”
https://www.cnbc.com/2019/06/14/us-b...-could-do.html