How Indonesia's notorious special forces train by drinking snake blood and breaking bricks with their heads

US Secretary of Defense Jim Mattis visited Indonesia on Tuesday to repair ties with the country's special forces, which committed gross human-rights violations under former Indonesian President Muhammad Suharto. 

Mattis was expecting to watch the Indonesian special forces, known as Kopassus, perform a hostage rescue drill - but instead saw them walk on fire, drink snake blood, roll in glass, and more.

Mattis seemed to enjoy the demonstration. 

"The snakes! Did you see them tire them out and then grab them? The way they were whipping them around - a snake gets tired very quickly," Mattis later told reporters, according to Reuters. 

Here's what the Indonesian special forces do: