
The First Regiment Oregon volunteer Cavalry was a volunteer regiment in United States service Union army that was formed in response to the American Civil War. With men recruited in Oregon and some recruited in surrounding states, the regiment primarily served to protect the state of Oregon and surrounding territories during the American Civil War.

The 1st Oregon Infantry Regiment was an American Civil War era military regiment recruited in Oregon for the Union Army. The regiment was formed in November 1864. At full strength, it was composed of ten companies of foot soldiers. The regiment was used to guard trade routes and escorted immigrant wagon trains from Fort Boise to the Willamette Valley. Its troops were used to pursue and suppress Native American raiders in eastern Oregon and the Idaho Territory. Several detachments accompanied survey parties and built roads in central and southern Oregon. The regiment's last company was mustered out of service in July 1867.

The 2nd Oregon Volunteer Infantry Regiment was a military regiment recruited in the U.S. state of Oregon during the Spanish–American War. As the first foreign war in U.S. history, it was the first time members of the Oregon National Guard had fought on foreign soil. The regiment also served with distinction in the Philippine–American War. At full strength, it was composed of 50 officers and 970 enlisted men. The regiment's last company was mustered out of service in August 1899.

The 41st Infantry Division was composed primarily of National Guard units from Idaho, Montana, Oregon, Washington, and Wyoming that saw active service in World War I and World War II. It was one of the first Army units to engage in offensive ground combat operations, during the last months of 1942. In 1965 it was reorganized as the 41st Infantry Brigade. The brigade has seen combat in the Iraq War in 2003 and 2008. Then again in Afghanistan in 2014.

The 41st Infantry Brigade Combat Team ("Sunset") is an element in the Oregon Army National Guard. Headquartered at Camp Withycombe, Clackamas, Oregon, it was part of the 7th Infantry Division based at Ft. Carson in Colorado. The brigade traces its lineage back to the 41st Infantry Division.

The 82nd Cavalry Regiment is a parent regiment in the United States Army National Guard. It is represented in the Oregon Army National Guard by the 1st Squadron, 82nd Cavalry, part of the 81st Stryker Brigade Combat Team.

The 114th Fighter Squadron is a unit of the Oregon Air National Guard 173d Fighter Wing located at Kingsley Field Air National Guard Base, Klamath Falls, Oregon. The 114th is equipped with the F-15C Eagle.

The 123d Fighter Squadron is a unit of the Oregon Air National Guard 142d Fighter Wing located at Portland Air National Guard Base, Oregon. The 123d is equipped with the F-15C Eagle.

The 125th Special Tactics Squadron is a special operations force unit serving as part of the 142nd Fighter Wing of the United States Air National Guard. They are based at the Portland Air National Guard Base in Portland, Oregon.

The 142nd Fighter Wing is a unit of the Oregon Air National Guard, stationed at Portland Air National Guard Base, Oregon. The 142nd Fighter Wing was redesignated the 142nd Wing as of March 6, 2020.

The 173d Fighter Wing is a unit of the Oregon Air National Guard, stationed at Kingsley Field Air National Guard Base, Klamath Falls, Oregon. If activated to federal service, the wing is gained by the Air Education and Training Command (AETC) of the United States Air Force.

The 186th Infantry Regiment is a combat regiment of the United States Army made up of soldiers from the Oregon Army National Guard. The 1st battalion of the regiment is currently active and as of February 2007 stateside, however, individual members are in Iraq as replacements for other active duty units. The 1/186th's higher headquarters is the 41st Infantry Brigade Combat Team, headquartered in Tigard, Oregon. Its higher headquarters, in turn, is the 40th Infantry Division

The 218th Field Artillery Regiment is a Field Artillery Regiment of the United States Army, Oregon Army National Guard. With lineage tracing back to 1866, it is the oldest National Guard artillery unit west of the Mississippi River continually serving. Today, its 2nd Battalion is a part of the 41st Infantry Brigade Combat Team and is currently headquartered in Forest Grove, Oregon.

The 249th Coast Artillery Regiment was a Coast Artillery Corps regiment in the Oregon National Guard. It garrisoned the Harbor Defenses of the Columbia, Oregon and Washington 1924–1944.

The 303d Expeditionary Rescue Squadron is a provisional unit of the United States Air Force. It is permanently deployed to Camp Lemonier, Djibouti. It was reactivated in 2013 as a forward deployed umbrella organization for rotational Sikorsky HH-60 Pave Hawk and pararescue/Guardian Angel combat search and rescue units of the Air Force Reserve deployed to U.S. Africa Command, specifically to Combined Joint Task Force-Horn of Africa.

The 304th Rescue Squadron is an Air Force Reserve Command combat search and rescue unit located at Portland Air National Guard Base, Oregon. The squadron is a geographically separated unit assigned to the 943d Rescue Group at Davis–Monthan Air Force Base, Arizona, and the 920th Rescue Wing at Patrick Air Force Base, Florida.

The 308th Rescue Squadron is an Air Force Reserve Command combat search and rescue unit located at Patrick Air Force Base, Florida. The squadron is assigned to the 920th Rescue Wing at Patrick Air Force Base, Florida.

The 323rd Cavalry Regiment was a cavalry unit of the United States Army during the interwar period. The unit was activated as a California, Washington, and Oregon Organized Reserve unit during the interwar period, although it was later relocated entirely to California. It was converted into a signal aircraft warning regiment after the United States entered World War II.

The 689th Radar Squadron is an inactive United States Air Force unit. It was last assigned to the 25th Air Division, stationed at Mount Hebo Air Force Station, Oregon. It was inactivated on 30 June 1979.

Keno Air Force Station is a closed United States Air Force General Surveillance Radar station. It is located 4.6 miles (7.4 km) south-southwest of Keno, Oregon. It was closed in 1979 by the Air Force, and turned over to the Federal Aviation Administration (FAA).

The 939th Air Refueling Wing is an inactive United States Air Force Reserve unit. It was last active with the Fourth Air Force, based at the Portland Air Reserve Station, Oregon. It was inactivated on 30 June 2008.

The 162nd Infantry Regiment is a regiment of the Oregon Army National Guard with headquarters in Springfield, Oregon. In January 2006 as part of the Army's transformation towards a modular force, the 1st Battalion, 162nd Infantry Regiment was inactivated. Many members continued to serve with the 2nd Battalion and other units within the 41st Infantry Brigade Combat Team.

Mountain Rangers was the nickname of an Oregon militia regiment formed during the American Civil War. A mounted unit, the Mountain Rangers were officially Company A, 1st Regiment, 1st Brigade, Oregon State Militia.

Young's Scouts was a select group of United States Army soldiers during the Philippine-American War organized under a Vermont civilian named William Henry Young.