The announcement comes months after inspectors found that at least 12 dogs sent to Jordan had died from medical problems.
The U.S. Navy says one of its drones suffered damage during a takeoff attempt that occurred in the Middle East last month.
The former vice president mentioned Trump by name only once in praising him for pulling out the 2015 nuclear deal with Iran.
Lawmakers called on Defense Secretary Mark Esper to clarify the Pentagon's plans.
Barely four months into his tenure, Defense Secretary Mark Esper is making his second trek across the Pacific.
Esper said he was looking for "serious and credible commitments" from allies to deter Iran.
"Do not mistake our restraint for weakness," Defense Secretary Mark Esper said.
Troops and air defenses are headed to the region in the wake of attacks on Saudi oil production facilities.
The U.S. will send hundreds of troops and air defense measures to Saudi Arabia and the United Arab Emirates to counter Iran.