Green Ops is the SAS nickname for Special Forces operations behind enemy lines during a war. Often includes sabotage, recon and surgical strikes. It also commonly includes lugging around 100 kgs of equipment and plastic explosive in deserts or forests, being shot at by lots of people, and dying unpleasantly. The pay is good, though, and unlike Black Ops you might get a medal if you die horribly (or even if you live).