Updated at 6:27 p.m. ET
President Trump has ordered some 1,500 troops to the Gulf region to serve a "mostly protective" purpose for American forces and interests.
Trump made the announcement to reporters on the White House lawn before boarding Marine One.
In a Pentagon briefing on Friday, Director of the Joint Staff Vice Adm. Michael Gilday would not say where the additional troops would be sent, other than that they would not be heading to Iraq and Syria.