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A South Korean Marine, right and a U.S. Marine from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, left, play a mock cavalry battle during their joint military winter exercise in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the Feb. 4-22 joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

South Korean Marines and U.S. counterparts from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, throw snow to one another during their joint military winter exercise in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the Feb. 4-22 joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

A South Korean Marine adjusts his gun on a snow-covered hill during their joint military winter exercise with U.S. counterparts in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

South Korean Marines walk while holding their guns on a snow-covered hill during their joint exercise with U.S. counterparts in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the Feb. 4-22 joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

A U.S. Marine from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, front, and a South Korean Marine aim their guns during their joint military winter exercise in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the Feb. 4-22 joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

South Korean Marines and U.S. counterparts from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, ski on a snow field while holding guns during their Feb. 4-22 joint military winter exercise in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

An unidentified U.S. Marine from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, aims his gun during their joint military winter exercise with South Korean counterparts in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the Feb. 4-22 joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

U.S. Marine from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, carry their guns and skies during their joint exercise with South Korean counterparts in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the Feb. 4-22 joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

South Korean Marines hold their guns on a snow-covered hill during their joint military winter exercise with U.S. counterparts in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

South Korean Marines and U.S. counterparts from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, aim their guns during their Feb. 4-22 joint military winter exercise in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

South Korean Marines and U.S. counterparts from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, ski on a snow field during their Feb. 4-22 joint military winter exercise in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

South Korean Marines and U.S. counterparts from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, aim their guns on a snow field during their Feb. 4-22 joint military winter exercise in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)

South Korean Marines and U.S. counterparts from 3-Marine Expeditionary Force 1st Battalion from Kaneho Bay, Hawaii, throw snow to one another during their joint military winter exercise in Pyeongchang, east of Seoul, South Korea, Thursday, Feb. 7, 2013. More than 400 marines from the two countries participated in the Feb. 4-22 joint winter exercise held for the first time in South Korea. (AP Photo/Lee Jin-man)