Is delta force real?

Yes, Delta is a real counter-terrorism unit within the US Army and JSOC. Most of the unit's details are classified, but twice a year, they perform Army-wide recruiting. They change official names every few years in order to keep foreign intelligence agencies guessing. Their last known names were Army Compartmented Element, or ACE, and Combat Applications Group, or CAG. Their most recent known operations were the rescue of Jessica Lynch and the death of al-Zarqawi.