Defense Secretary Lloyd Austin is sending additional bomber aircraft and Navy warships to the Middle East to bolster the U.S. presence in the region as an aircraft carrier and its warships are preparing to leave, U.S. officials said Friday.

Austin ordered several B-52 Stratofortress bomber aircraft, tanker aircraft and Navy destroyers to deploy to the Middle East, according to four U.S. and defense officials who spoke on condition of anonymity to discuss troop movements.

The moves come at a critical time as Israel’s wars with Hamas in Gaza and Hezbollah in Lebanon rage, even as officials press for a cease-fire. The U.S. has repeatedly said it will defend Israel and continue to protect American and allied presence in the region, including from Yemen-based Houthi attacks against ships in the Red Sea.

The long-range nuclear-capable B-52 bomber has been repeatedly deployed to the Middle East in pointed warnings to Iran and it is the second time this month that strategic U.S. bombers will be used to bolster U.S. defenses in the region. Earlier this month, B-2 stealth bombers were used to strike underground Houthi targets in Yemen.

Officials did not provide specific number of aircraft and ships that will move into the region. There have been as many as 43,000 U.S. forces in the region recently.