Question: The 304th Sustainment Brigade is headquartered at the home to the Air Force Reserve Command's 4th Air Force (4 AF) Headquarters and the host 452d Air Mobility Wing which was also a Strategic Air Command base during the Cold War for about how many years?

Context paragraphs:
Continental Air Forces: Continental Air Forces (CAF) was a United States Army Air Forces major command at the end of World War II and during the early Cold War for combat training of bomber and fighter personnel and for Continental United States (CONUS) air defense after the Aircraft Warning Corps and Ground Observer Corps were placed in standby during 1944.  CAF conducted planning for the postwar United States general surveillance radar stations, and the planning to reorganize to a separate USAF was for CAF to become the USAF Air Defense Command (ADC was headquartered at CAF's Mitchel Field instead of the CAF HQ at Bolling Field.)  On 21 March 1946, CAF headquarters personnel and facilities at Bolling Field, along with 1 of the 4 CAF Air Forces (2nd—which had its HQ inactivated on 30 March ) became Strategic Air Command.  US Strategic Air Forces of WWII, e.g., Eighth Air Force and Fifteenth Air Force, transferred later to SAC.  Most of the CAF airfields that had not been distributed to other commands when SAC activated were subsequently transferred to Air Defense Command (to which CAF's 1st & 4th Air Forces were assigned on 21 March), Tactical Air Command (3rd Air Force), and Air Materiel Command from 23 March 1946 to 16 March 1947 before the USAF was activated in September 1947.

March Air Reserve Base: March Air Reserve Base (IATA: RIV, ICAO: KRIV, FAA LID: RIV) (March ARB), previously known as March Air Force Base (March AFB) is located in Riverside County, California between the cities of Riverside and Moreno Valley.  It is the home to the Air Force Reserve Command's 4th Air Force (4 AF) Headquarters and the host 452d Air Mobility Wing (452 AMW), the largest air mobility wing of the 4th Air Force.  In addition to multiple units of the Air Force Reserve Command supporting Air Mobility Command, Air Combat Command and Pacific Air Forces, March ARB is also home to units from the Army Reserve, Navy Reserve, Marine Corps Reserve, California Air National Guard and the California Army National Guard.  For almost 50 years, March AFB was a Strategic Air Command base during the Cold War.

730th Air Mobility Training Squadron: The 730th Air Mobility Training Squadron is an Air Force reserve unit stationed at Altus Air Force Base, Oklahoma, where it trans airmen on Boeing C-17 Globemaster III, Boeing KC-135 Stratotanker and Boeing KC-46 Pegasus aircraft systems.  It is assigned to the 507th Operations Group at Tinker Air Force Base, Oklahoma, but performs its training mission under the direction of the 97th Air Mobility Wing of Air Education and Training Command.

304th Sustainment Brigade (United States): The 304th Sustainment Brigade is a sustainment brigade of the United States Army Reserve.  It is headquartered at March Air Reserve Base near Riverside, California.

507th Air Refueling Wing: The 507th Air Refueling Wing is a reserve component of the United States Air Force.  It is assigned to Fourth Air Force of Air Force Reserve Command, stationed at Tinker Air Force Base, Oklahoma with elements at Altus Air Force Base and Will Rogers World Airport.  If mobilized, the wing is gained by Air Mobility Command.  It performs air refueling and airlift and employs approximately 1100 men and women.  The wing also provides the full-time technicians and support personnel for all reserve units stationed at Tinker.

452d Air Mobility Wing: The 452d Air Mobility Wing is an Air Reserve Component of the United States Air Force.  It is assigned to the Fourth Air Force, Air Force Reserve Command, stationed at March Air Reserve Base, California.  If mobilized, the Wing is gained by the Air Mobility Command.

349th Air Mobility Wing: The 349th Air Mobility Wing is an Air Reserve Component of the United States Air Force.  It is assigned to the Fourth Air Force, Air Force Reserve Command, stationed at Travis Air Force Base, California.  The 349th AMW is an associate unit of the 60th Air Mobility Wing, Air Mobility Command (AMC) and if mobilized the wing is gained by AMC.

15th Sustainment Brigade: The 15th Sustainment Brigade was a sustainment brigade of the United States Army based at Fort Bliss, Texas.  It provided logistics support to other units of the United States Army, and was subordinate to the 13th Sustainment Command (Expeditionary).  It previously had provided support to the 1st Cavalry Division, but now did so for the 1st Armored Division until 12 May 2015 when the 15th Sustainment Brigade became part of the 1st Armored Division and was renamed 1st Armored Division Sustainment Brigade.

111th Sustainment Brigade (United States): The 111th Sustainment Brigade started out as the 111th Air Defense Artillery Brigade of the United States Army.  On 1 February 2008, this New Mexico National Guard Army unit ceased its air defense mission and was reorganized and redesignated as a maneuver enhancement brigade.  Similar to a special troops battalion, its mission was to support units of the Regular Army.  On the 1st of September 2016, the brigade was redesignated, once again, as a sustainment brigade that focuses on providing mission command for combat support and combat service support units.  The brigade is designed to operate independently in a theater of operations, in conjunction with other sustainment brigades under the command of a sustainment command (expeditionary), or directly under a theater sustainment command.

Lockheed C-141 Starlifter: The Lockheed C-141 Starlifter was a military strategic airlifter that served with the Military Air Transport Service (MATS), its successor organization the Military Airlift Command (MAC), and finally the Air Mobility Command (AMC) of the United States Air Force (USAF).  The aircraft also served with airlift and air mobility wings of the Air Force Reserve (AFRES), later renamed Air Force Reserve Command (AFRC), the Air National Guard (ANG) and, later, one air mobility wing of the Air Education and Training Command (AETC) dedicated to C-141, C-5, C-17 and KC-135 training.

Supporting paragraphs: 304th Sustainment Brigade (United States) March Air Reserve Base
Answer: 50