I think I posted this a bit over a year ago somewhere on the board, but I figure it also fits here as a bit of a reference piece in this discussion:

General Orders No. 10
Headquarters, Department of the Army
Washington, DC, 25 September 2006

UNITS CREDITED WITH ASSAULT LANDINGS
II—LIST. The following units were designated by the Senior Army Commander in the theater of operations as having participated in a parachute (to include freefall), amphibious, or helicopter assault landing.

......

b. Helmand Desert, Afghanistan (Parachute), 1845Z-0014Z hours, 19 October 2001 to 20 October 2001.

75th Ranger Regiment, Headquarters and Headquarters Company, Detachment
75th Ranger Regiment, 3d Battalion, Headquarters and Headquarters Company, Detachment
75th Ranger Regiment, 3d Battalion, Company A, Detachment
75th Ranger Regiment, 3d Battalion, Company C, Detachment

c. In the vicinity of Alimarden Kan-E-Bagat, Afghanistan (Parachute), 1800Z-2334Z hours, inclusive, 13 November 2001.

75th Ranger Regiment, 3d Battalion, Company B, Detachment

d. Near Chahar Borjak, Nimruz Province, Afghanistan (Parachute), 1345Z-1445Z hours, inclusive, 25 February 2003.

75th Ranger Regiment, 2d Battalion, Headquarters and Headquarters Company, Detachment
75th Ranger Regiment, 2d Battalion, Company A, Detachment
75th Ranger Regiment, 2d Battalion, Company C, Detachment
504th Infantry, 3d Battalion, Company B, Detachment

.......

w. Bashur Drop Zone in Northern Iraq (Parachute), 1700Z to 1737Z hours, inclusive, 26 March 2003.

1st Special Forces, 10th Special Forces Group, 2d Special Forces Battalion, Detachment
74th Infantry, Detachment
173d Airborne Brigade, Headquarters and Headquarters Company
173d Support Company
250th Medical Detachment
319th Field Artillery, Battery D
501st Support Company
503d Infantry, 2d Battalion
508th Infantry, 1st Battalion
4th Air Support Operations Squadron (United States Air Force)
86th Contingency Response Group (United States Air Force)

x. Northwestern Desert region of Iraq, in the vicinity of the town of Al Qaim, near the Syrian boarder (Parachute), 1830Z to 2230Z hours, inclusive, 24 March 2003.

75th Ranger Regiment, 3d Battalion, Company C
75th Ranger Regiment, 3d Battalion, Headquarters and Headquarters Company, Detachment
24th Special Tactics Squadron, Detachment (United States Air Force)

y. At H1 airfield in western Iraq, west of the Haditha Dam and the town of Haditha (Parachute), 1835Z to 1200Z hours, 28 and 29 March 2003.

27th Engineer Battalion, Detachment
75th Ranger Regiment, 3d Battalion, Headquarters and Headquarters Company, Detachment
75th Ranger Regiment, 3d Battalion, Company A
24th Special Tactics Squadron, Detachment (United States Air Force)

z. Southeastern region of Afghanistan (Free Fall), 1735Z to 1800Z hours, inclusive, 3 July 2004.

75th Ranger Regiment, Headquarters and Headquarters Company, Regimental Reconnaissance Detachment, Team 3