In general usage, the term also refers to irregular or guerrilla tactics carried out by small regular units. The commando originated with the Boers in South Africa, where it was the administrative and tactical unit “commandeered” by law.

Where did the word commando come from?

From an ancient lingual perspective the term commando derives from Latin commendare, to recommend. From perspective of late history the word stems from the Dutch word kommando, which translates as "a command or order" and also roughly to "mobile infantry regiment".

Why do they call it going commando?

Why go commando? “Going commando” is a way of saying that you're not wearing any underwear. The term refers to elite soldiers trained to be ready to fight at a moment's notice. So when you're not wearing any underwear, you're, well, ready to go at any moment — without pesky undies in the way.