Special Operations: The 2nd Battalion of the U.S. 5th Special Forces Group, United States Army Special Forces (Green Berets) conducted reconnaissance in the cities of Basra, Karbala and various other locations.

In the North, the 10th Special Forces Group (10th SFG) and CIA paramilitary officers from their Special Activities Division had the mission of aiding the Kurdish parties, the Patriotic Union of Kurdistan and the Kurdistan Democratic Party, de facto rulers of Iraqi Kurdistan since 1991, and employing them against the 13 Iraqi Divisions located near Kirkuk and Mosul. Turkey had officially prohibited any Coalition troops from using their bases or airspace, so lead elements of the 10th SFG had to make a detour infiltration; their flight was supposed to take four hours but instead took ten.

Hours after the first of such flights, Turkey did allow the use of its air space and the rest of the 10th SFG infiltrated in. The preliminary mission was to destroy the base of the Kurdish terrorist group Ansar al-Islam, believed to be linked to Al Qaeda. Concurrent and follow-on missions involved attacking and fixing Iraqi forces in the north, thus preventing their deployment to the southern front and the main effort of the invasion.

On March 26, 2003, the 173rd Airborne Brigade augmented the invasion's northern front by parachuting into northern Iraq onto Bashur Airfield, controlled at the time by elements of 10th SFG and Kurdish peshmerga. The fall of Kirkuk on April 10, 2003 to the 10th SFG, CIA Paramilitary Teams and Kurdish peshmerga precipitated the 173rd's planned assault, preventing the unit's involvement in combat against Iraqi forces during the invasion.

The successful occupation of Kirkuk came as a result of approximately two weeks of fighting that included the Battle of the Green Line (the unofficial border of the Kurdish autonomous zone) and the subsequent Battle of Kani Domlan Ridge (the ridgeline running northwest to southeast of Kirkuk), the latter fought exclusively by 3rd Battalion, 10th SFG and Kurdish peshmerga against the Iraqi I Corps. The 173rd Brigade would eventually take responsibility for Kirkuk days later, becoming involved in the counterinsurgency fight and remain there until redeploying a year later.

Further reinforcing operations in Northern Iraq, the 26th Marine Expeditionary Unit (Special Operations Capable), serving as Landing Force Sixth Fleet, deployed in April to Erbil and subsequently Mosul via Marine KC-130 flights. The 26 MEU(SOC) maintained security of the Mosul airfield and surrounding area until relief by the 101st Airborne Division.

After Sargat was taken, Bravo Company, 3rd Battalion, 10th SFG and CIA paramilitary officers along with their Kurdish allies pushed south towards Tikrit and the surrounding towns of Northern Iraq. Previously, during the Battle of the Green Line, Bravo Company, 3/10 with their Kurdish allies pushed back, destroyed, or routed the 13th Iraqi Infantry Division. The same company took Tikrit. Iraq was the largest deployment of Special Forces since Vietnam.