These pictures of Marines drinking Cobra blood are as grisly as you'd expect
Every year, the United States team with its Pacific allies for a military exercise in Thailand, Cobra Gold. Cobra Gold is the largest multinational military exercise in which the U.S. participates and has been an ongoing exercise for more than 30 years. In 2015, Cobra Gold included 26 nations, and for the first time, included China. The exercise smooths interoperability between nations in the region, especially when coordinating responses to a crisis, like Tsunamis and Typhoons.
The operation consists of a live fire exercise, a command post exercise, and (as with many military exercises) an operation to benefit the local population. There is also a jungle survival Training exercise where Thai Marines train U.S. troops to find water, which foods are safe to eat (scorpions!), and famously, demonstrate how they subdue a Cobra.
After the jungle training, those in attendance are given the option to participate in the Thai custom of drinking the Cobra’s blood.