Here are incredible photos of the military drill that's freaking out North Korea

Foal Eagle 2015Lee Jin-man/APSouth Korean Navy’s air cushion landing craft approaches to the beach as U.S. Marine takes his position during the U.S.-South Korea joint landing military exercises as a part of the annual joint military exercise Foal Eagle between South Korea and the United States in Pohang, south of Seoul, South Korea, Monday, March 30, 2015.

Operation Foal Eagle 2015, which runs from March 2 to April 24, features US and South Korean Marines practicing amphibious beach assaults along with aerial and naval operations.

The operation involves 12,500 US troops, along with an astonishing 200,000 of their South Korean counterparts.

Because Foal Eagle takes place in South Korea, North Korea views it as a possible practice run for an invasion. Pyongyang has ratcheted up the rhetoric and has threatened that Foal Eagle 2015 would be greeted with a “merciless baptism by fire.”

In response to the start of Foal Eagle, North Korea launched two SCUD missiles into the sea outside of South Korea on March 2. On March 12, North Korea fired an additional seven surface-to-air missiles to protest against the exercise.

Operation Foal Eagle is carried out in the spirit of the 1953 South Korea-US Mutual Defence Treaty, which obligates the US to intervene if the north ever invaded again.

South Korean marine's amphibious assault vehicles sail to shores in a smoke screen for landing during the U.S.-South Korea joint landing military exercises as a part of the annual joint military exercise Foal Eagle between South Korea and the United States in Pohang, south of Seoul, South Korea, Monday, March 30, 2015.

The bilateral exercise is conducted by South Korea and the US. It allows the two nations to practice land, air, naval, and sea operations.

Amphibious assault vehicles of the South Korean Marine Corps throw smoke bombs as they move to land on shore during a U.S.-South Korea joint landing operation drill in Pohang March 30, 2015. The drill is part of the two countries' annual military training called Foal Eagle, which runs from March 2 to April 24.

The drill features the use of smoke screens during an amphibious invasion ...

Amphibious assault vehicles of the South Korean Marine Corps throw smoke bombs as they move to land on shore during a U.S.-South Korea joint landing operation drill in Pohang March 30, 2015. The drill is part of the two countries' annual military training called Foal Eagle, which runs from March 2 to April 24.

... and beach-head assaults once the soldiers make landfall.

U.S. and South Korean marines participate in a U.S.-South Korea joint landing operation drill in Pohang March 30, 2015. The drill is part of the two countries' annual military training called Foal Eagle, which runs from March 2 to April 24.

Korean Marines spearheaded the landing operations ...

South Korean Marines run after they landed on the beach during the U.S.-South Korea joint landing military exercises as a part of the annual joint military exercise Foal Eagle between South Korea and the United States in Pohang, south of Seoul, South Korea, Monday, March 30, 2015.

On the beach, US forces join their South Korean counterparts.

South Korean Navy's air cushion landing craft approaches to the beach as U.S. Marine takes his position during the U.S.-South Korea joint landing military exercises as a part of the annual joint military exercise Foal Eagle between South Korea and the United States in Pohang, south of Seoul, South Korea, Monday, March 30, 2015.

The drill aims to foster interoperability between the two militaries, which would have to fight side-by-side in the event of a North Korean invasion.

U.S. and South Korean marines participate in a U.S.-South Korea joint landing operation drill in Pohang March 30, 2015. The drill is part of the two countries' annual military training called Foal Eagle, which runs from March 2 to April 24.

North Korea accuses the US of using the exercises as a practice run for an invasion.

South Korean marines participate in a U.S.-South Korea joint landing operation drill as Amphibious assault vehicles of the South Korean Marine Corps throw smoke bombs in Pohang March 30, 2015. The drill is part of the two countries' annual military training called Foal Eagle, which runs from March 2 to April 24.

South Korea and the US maintain that Foal Eagle is a strictly defensive exercise.

South Korean Marines take their position near amphibious assault vehicle during the U.S.-South Korea joint landing military exercises as a part of the annual joint military exercise Foal Eagle between South Korea and the United States in Pohang, south of Seoul, South Korea, Monday, March 30, 2015.

The exercises allow American Marines to run through the full spectrum of amphibious operations.

South Korean Marine, right and U.S. Marines aim their weapon near amphibious assault vehicles during the U.S.-South Korea joint landing military exercises as a part of the annual joint military exercise Foal Eagle between South Korea and the United States in Pohang, south of Seoul, South Korea, Monday, March 30, 2015.

The Korean War ended in an armistice meaning that North and South Korea technically still remain at war ...

South Korean Marine, right and U.S. Marine, left, run on the beach after landing from amphibious assault vehicles during the U.S.-South Korea joint landing military exercises as a part of the annual joint military exercise Foal Eagle between South Korea and the United States in Pohang, south of Seoul, South Korea, Monday, March 30, 2015.

... So any military exercise on either side of the border is viewed with extreme suspicion and even alarm.

U.S. Army soldiers take part in a U.S.-South Korea joint live-fire military exercise at a training field in Pocheon, south of the demilitarized zone separating the two Koreas, March 25, 2015. The exercise is part of Foal Eagle, an annual military training between U.S. and South Korea that runs from March 2 to April 24

Foal Eagle involves 12,500 US troops and approximately 200,000 South Korean military personnel.

A U.S. marine participates in a U.S.-South Korea joint landing operation drill in Pohang March 30, 2015. The drill is part of the two countries' annual military training called Foal Eagle, which runs from March 2 to April 24.

Foal Eagle also gives US and South Korea the chance to train on a variety of platforms.

A U.S. Army soldier aims his weapon inside a U.S. Army Black Hawk helicopter as they take part in a U.S.-South Korea joint live-fire military exercise at a training field in Pocheon, south of the demilitarized zone separating the two Koreas, March 25, 2015. The exercise is part of Foal Eagle, an annual military training between U.S. and South Korea that runs from March 2 to April 24

The two allies make use of helicopters ...

U.S Army CH-47 Chinook and Black Hawk helicopters take part in a U.S.-South Korea joint live-fire military exercise at a training field in Pocheon, south of the demilitarized zone separating the two Koreas, March 25, 2015. The exercise is part of Foal Eagle, an annual military training between U.S. and South Korea that runs from March 2 to April 24

... And practice logistical work by airlifting critical supplies, such as artillery, to drop zones.

U.S. Army's Chinook helicopter, center, carrying a towed artillery flies with Blackhawk helicopters during a combined arms live-fire exercise as a part of the annual joint military exercise Foal Eagle between South Korea and the United States at the Rodriquez Multi-Purpose Range Complex in Pocheon, north of Seoul, South Korea, Wednesday, March 25, 2015.

This year also marked the first time that a US littoral combat ship, the Navy's troubled one-time ship of the future, visited the Korean peninsula.

The U.S. Navy's littoral combat ship USS Fort Worth (LCS-3) is moored at a South Korean naval port in the southeastern port city of Busan Saturday, March 14, 2015. USS Fort Worth, the first U.S. Navy's littoral combat ship to visit South Korea, is participating in the annual Foal Eagle exercise with the South Korean Navy.

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