The additional forces would raise the total number of troops in the region to as many as 43,000.
The increased presence will involve multiple fighter jet and attack aircraft squadrons, Pentagon spokeswoman Sabrina Singh told reporters. U.S. officials said the total includes small numbers of other troops to augment the presence as well.
It follows recent strikes in Lebanon and the assassination of Hezbollah leader Hassan Nasrallah, a significant escalation in the war in the Middle East, this time between Israel and Hezbollah.
The additional personnel includes squadrons of F-15E, F-16, and F-22 fighter jets and A-10 attack aircraft, and the personnel needed to support them. The jets were supposed to rotate in and replace the squadrons already there. Instead, both the existing and new squadrons will remain in place to double the airpower on hand.