91st Operations Group The 91st Operations Group ( 91 OG ) is the operational component of the 91st Missile Wing , assigned to the Air Force Global Strike Command Twentieth Air Force . It is stationed at Minot Air Force Base , North Dakota . The 91 OG is one of three USAF operational missile units , equipped with the LGM - 30G Minuteman - III . Its mission is to defend the United States with safe and secure Intercontinental Ballistic Missiles ( ICBMs ) ; ready to immediately put bombs on target . Activated as the World War II 91st Bombardment Group ( Heavy ) , an Eighth Air Force B - 17 Flying Fortress unit assigned to England , it was one of the first USAAF heavy bomb groups deployed to Europe in 1942 . The 91st Bomb Group was stationed at RAF Bassingbourn and is most noted as the unit in which the bomber Memphis Belle flew , and for having suffered the greatest number of losses of any heavy bomb group in World War II . As part of Strategic Air Command in the early years of the Cold War , the 91st Strategic Reconnaissance Group provided worldwide surveillance . Inactivated in 1952 , the group was reactivated as the 91 OG in 1991 . Its three missile squadrons , however , have no traditional link to the 91st Bombardment Group and were previously part of the 455th Strategic Missile Wing and 455th Bomb Group . Units . Through its five squadrons , the group remains a key facet of our nation ' s deterrent force . The five squadrons assigned to the group are the : The Missile Squadrons include missile crewmembers , alert facility chefs and facility managers . These squadrons vigilantly maintain the missile force around - the - clock . Each squadron controls 50 launch facilities and five missile alert facilities . Missile squadrons are divided into missile operations flights and an operation support flight . The missile operations flights are staffed by officer crewmembers who , when on alert , are responsible for day - to - day operations , maintenance and security of the missiles within their control and are prepared to launch their missiles at all times . Facility managers are responsible for and ensure the readiness of the missile alert facilities . The alert facility chefs are responsible for providing meals to missile alert facility personnel . History . World War II . Trained with B - 17s before moving to England , August – October 1942 . Entered combat in November 1942 , bombing such targets as submarine pens , airdromes , factories , communication targets , shipbuilding yards , harbors , and dock facilities until mid - 1943 . When Eighth Air Force heavy bombers first penetrated Germany on 27 January 1943 , the group attacked the navy yard at Wilhelmshaven . Earned a Distinguished Unit Citation ( DUC ) for bombing marshalling yards at Hamm on 4 March 1943 , despite adverse weather and heavy opposition . From the middle of 1943 until the war ended , attacked aircraft factories , airfields , oil facilities , chemical industries and ball - bearing factories . Earned a second DUC for attacking vital aircraft factories in central Germany on 11 January 1944 despite inadequate fighter cover , heavy enemy opposition , and bad weather . In June 1944 , contributed to the Allied invasion of Normandy by bombing gun emplacements and troop concentrations near the beachhead area . Supported the St . Lo breakthrough by attacking enemy troop positions , 24 – 25 July 1944 . In December 1944 – January 1945 , participated in the Battle of the Bulge by attacking enemy communication targets . The group supported the Allied crossing of the Rhine River in the spring of 1945 by striking airfields , bridges , and railroads near the front lines . After the war ended , evacuated prisoners from German camps . Returned to the United States , June – July 1945 Cold War . Activated as a long - range photographic reconnaissance group under Strategic Air Command in July 1947 , but was not fully manned until after July 1948 . Combat in Korea , November 1950 – July 1953 and conducted surveillance over Sea of Japan . During the Korean War , the 91st SRG eventually flew the largest number of different airframes in the Korean War and had more assigned personnel than any other flying unit in the Korean War . With over 800 assigned personnel , they had six different types of aircraft assigned , to include : the RB - 29 , RB - 50 , RB - 45 , WB - 26 , KB - 29 and RB - 36 . Throughout the conflict though , the RB - 29 and RB - 50s were the workhorses of the unit . The RB - 50 was a modification of the high altitude bomber built towards the end of World War II to bomb Japan . The 91st worked a number of different missions during the Korean War . In addition to bomb damage assessment , targeting and aerial photography for the Bomber Command and FEAF , the 91st conducted ELINT and “ ferret ” missions in theater . It conducted the first ferret missions ever conducted by the USAF . Overflights of Soviet - controlled Far East islands began in 1951 . An example of this type of work was reconnaissance missions which were conducted over Karafuto following reports that the Soviets had built extensive underground installations and missile - launching facilities on the island . In Project 51 , 91st SRW RB - 45s took off from Yokota AB , Japan to conduct reconnaissance over the southern portions of Sakhalin Island . Photographic and radar reconnaissance overflight missions were also flown over the Murmansk - Kola inlet and Siberia . The unit was also called upon to conducted psychological leaflet drops with its assigned RB - 29 aircraft . Not only did the 91st drop Korean “ Psyops ” leaflets throughout the Korean peninsula and into Manchuria and China but Russian language leaflets were also committed to air bases in the Far East where Russian pilots were suspected of flying from In addition to these missions . 91st aircraft also provided the Air Force ’ s first air - to - air refueling capability and is credited with the very first refueling conducted in combat . In February 1951 , lost most of its personnel when assigned to the parent wing , and was inactivated in May 1952 as part of the Tri - Deputation reorganization . Modern era . Between September 1991 and July 1994 , and since February 1996 , maintained intercontinental ballistic missiles on alert at Minot AFB , ND .