US marines react as a cobra gets too close to them during a jungle survival exercise with the Thai Navy as part of the "Cobra Gold 2013" joint military exercise, at a military base in Chon Buri province, Thailand, Feb 20, 2013. About 13,000 soldiers from seven countries, Thailand, US, Singapore, Indonesia, Japan, South Korea and Malaysia are participating in the 11-day military exercise. [Photo/Agencies]

A US marine drinks the blood of a cobra during a jungle survival exercise with the Thai Navy as part of the "Cobra Gold 2013" joint military exercise, at a military base in Chon Buri province, Thailand, Feb 20, 2013. [Photo/Agencies]