- F-22 stealth fighters, B-2 stealth bombers, and B-52 bombers took part in Exercise 'Foal Eagle 2013'.
- Separately, Washington hopes to use missile defence assets such as the THAAD system and Arleigh Burke-class destroyers to counter North Korean missile threats.
Joint military exercises in South Korea have served as a forum for displaying military hardware meant to deter North Korea, which has ramped up its threatening rhetoric in recent weeks.
The US military has used Exercise 'Foal Eagle 2013' - an annual event often viewed as an opportunity to deter Pyongyang - as a venue to showcase its high-end weapons systems as North Korea has, throughout March and early April, threatened to attack South Korea and US territory.
Two F-22 Raptor stealth fighter aircraft deployed on 31 March to Osan Air Base in South Korea, marking the fifth-generation fighter's fourth deployment to the peninsula.
"The aircraft are on static display at Osan Air Base as part of the 'Foal Eagle' exercise to provide bilateral training for the US and RoK [Republic of Korea] military and to provide South Korean senior leaders with an orientation to the aircraft, which are an advanced capability available for the defence of South Korea," Pentagon spokesman George Little said on 1 April.
The F-22s are stationed at Kadena Air Base in Japan with the 94th Expeditionary Fighter Squadron.
Also under the auspices of 'Foal Eagle', which runs until the end of April, on 28 March US Strategic Command sent two B-2 Spirit stealth bombers for "a long-duration, round-trip training mission" from Whiteman Air Force Base in Missouri to the RoK.
US Force Korea (USFK) said in a statement that the practice bombing run demonstrated "the commitment of the United States and its capability to defend the RoK and to provide extended deterrence to our allies in the Asia-Pacific region".