Before revision: The Special Operations Branch (SO) was a branch of the Office of Strategic Services during World War II that "pioneered" many of the Unconventional Warfare, Counter-Insurgency (COIN), and Foreign Internal Defense tactics and techniques used by today's US Military Special Operations Forces (SOF).
After revision: The Special Operations Branch (SO) was a branch of the Office of Strategic Services during World War II that "pioneered" many of the unconventional warfare, counter-insurgency (COIN), and foreign internal defense tactics and techniques used by today's US Military Special Operations Forces (SOF).