Defense Secretary Mark Esper says this is a first step, and he is not ruling out additional moves down the road. He says it's a response to requests from the Saudis and the UAE to help improve their air and missile defenses.
Esper and Gen. Joseph Dunford, chairman of the Joint Chiefs of Staff, say details of the deployments will be determined over the coming days.
President Donald Trump is signaling that he's not inclined to authorize an immediate military strike on Iran in response to the attacks on the Saudi oil industry, saying he believes showing restraint "shows far more strength" and he wants to avoid an all-out war.
Trump has laid out new sanctions on the Iranian central bank.
Trump spoke just before he gathered his national security team at the White House to discuss how to respond to the weekend drone and missile attack on oil facilities in Saudi Arabia.
He left the door open a bit for a later military response, saying people thought he'd attack Iran "within two seconds." But he says he has "plenty of time."