The U.S. has deployed B-1B bombers to the Korean Peninsula to take part in the joint Seoul-Washington air combat drills.
South Korean military officials said on Wednesday that the bombers stationed in Guam arrived to conduct a bombing drill with South Korea's fighter jets.
The U.S. usually deploys B-1B in pairs after North Korea's provocations in a show of force, or on routine training missions.
The last deployment of B-1B bombers came in early November ahead of U.S. President Donald Trump's regional trip.
Seoul and Washington have been conducting a massive air combat drill known as Vigilant Ace.
Over 200 warplanes are taking part, including two dozen stealth fighter jets.
Six F-22s and six F-35s have been deployed to the Korean peninsula, marking the first time the highly-advanced jets have cruised the skies above South Korea at the same time.
Other U.S. assets include two B-1B bombers and six Growler electronic warfare jets, as well as dozens of F-15s and F-16s.
South Korea has deployed 90 fighter jets, including its F-15 and FA-50 fighters.
The exercises are scheduled to run through Friday.
Kim Hyun-bin, Arirang News.