In the recap Sam's statement about Gurkhas has been changed from calling them mercenaries, to calling them commandos, it is still wrong.
Gurkhas are just ordinary soldiers; except better.
Gurkhas aren't any different from any other soldiers, except for being far more deadly. "hunting high value targets, interrogations, counter surveillance," are not just what they do in the military, they are members of every branch of the army. (Eg. cooks aren't known for their work in interrogation.)
"Disinformation" was not the word Callen was looking for, disinformation is propaganda and involves spreading misinformation to a large number of people to deceive for a purpose. He meant misinformation, which is untrue statements made without specific purpose.