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RocketShip delivers third Delta IV Heavy booster at VAFB

The hatch opens on a United Launch Alliance barge, known as the RocketShip, revealing a Delta IV Heavy booster May 4, 2020, at Vandenberg Air Force Base, Calif. The barge docked at Vandenberg AFB to offload the final Delta IV Heavy booster for an upcoming launch scheduled to occur later this year. The barge operation is a vital first step to executing the mission of assured access to space. (U.S. Air Force photo by Senior Airman Aubree Owens)

The hatch opens on a United Launch Alliance barge, known as the RocketShip, revealing a Delta IV Heavy booster May 4, 2020, at Vandenberg Air Force Base, Calif. The barge docked at Vandenberg AFB to offload the final Delta IV Heavy booster for an upcoming launch scheduled to occur later this year. The barge operation is a vital first step to executing the mission of assured access to space. (U.S. Air Force photo by Senior Airman Aubree Owens)

Mission partners and base members extract a Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, May 4, 2020, at Vandenberg Air Force Base, Calif. The barge docked at Vandenberg AFB to offload the final Delta IV Heavy booster for an upcoming launch scheduled to occur later this year. The barge operation is a vital first step to executing the mission of assured access to space. (U.S. Air Force photo by Senior Airman Aubree Owens)

Mission partners and base members extract a Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, May 4, 2020, at Vandenberg Air Force Base, Calif. The barge docked at Vandenberg AFB to offload the final Delta IV Heavy booster for an upcoming launch scheduled to occur later this year. The barge operation is a vital first step to executing the mission of assured access to space. (U.S. Air Force photo by Senior Airman Aubree Owens)

Mission partners and base members extract a Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, May 4, 2020, at Vandenberg Air Force Base, Calif. The barge docked at Vandenberg AFB to offload the final Delta IV Heavy booster for an upcoming launch scheduled to occur later this year. The barge operation is a vital first step to executing the mission of assured access to space. (U.S. Air Force photo by Senior Airman Aubree Owens)

Mission partners and base members extract a Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, May 4, 2020, at Vandenberg Air Force Base, Calif. The barge docked at Vandenberg AFB to offload the final Delta IV Heavy booster for an upcoming launch scheduled to occur later this year. The barge operation is a vital first step to executing the mission of assured access to space. (U.S. Air Force photo by Senior Airman Aubree Owens)

Mission partners guide a Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, to a Horizontal Integration Facility, May 4, 2020, at Vandenberg Air Force Base, Calif. This was the third and final booster delivered on the RocketShip, which was offloaded four weeks after the first two due to weather conditions. (U.S. Air Force photo by Senior Airman Aubree Owens)

Mission partners guide a Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, to a Horizontal Integration Facility, May 4, 2020, at Vandenberg Air Force Base, Calif. This was the third and final booster delivered on the RocketShip, which was offloaded four weeks after the first two due to weather conditions. (U.S. Air Force photo by Senior Airman Aubree Owens)

A Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, proceeds to the Horizontal Integration Facility May 4, 2020, at Vandenberg Air Force Base, Calif. A HIF is a building within which the stages of a multistage rocket are brought together before the assembled stack is rolled out to the launch pad or space launch complex and raised into a vertical position for final integration and launch. (Courtesy photo)

A Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, proceeds to the Horizontal Integration Facility May 4, 2020, at Vandenberg Air Force Base, Calif. A HIF is a building within which the stages of a multistage rocket are brought together before the assembled stack is rolled out to the launch pad or space launch complex and raised into a vertical position for final integration and launch. (Courtesy photo)

A Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, proceeds to the Horizontal Integration Facility May 4, 2020, at Vandenberg Air Force Base, Calif. A HIF is a building within which the stages of a multistage rocket are brought together before the assembled stack is rolled out to the launch pad or space launch complex and raised into a vertical position for final integration and launch. (Courtesy photo)

A Delta IV Heavy booster from a United Launch Alliance barge, known as the RocketShip, proceeds to the Horizontal Integration Facility May 4, 2020, at Vandenberg Air Force Base, Calif. A HIF is a building within which the stages of a multistage rocket are brought together before the assembled stack is rolled out to the launch pad or space launch complex and raised into a vertical position for final integration and launch. (Courtesy photo)

Three Delta IV Heavy boosters, which were extracted from a United Launch Alliance barge known as the RocketShip, are placed in a Horizontal Integration Facility, May 4, 2020, at Vandenberg Air Force Base, Calif. A HIF is a building within which the stages of a multistage rocket are brought together before the assembled stack is rolled out to the launch pad or space launch complex and raised into a vertical position for final integration and launch. (U.S. Air Force photo by Senior Airman Aubree Owens)

Three Delta IV Heavy boosters, which were extracted from a United Launch Alliance barge known as the RocketShip, are placed in a Horizontal Integration Facility, May 4, 2020, at Vandenberg Air Force Base, Calif. A HIF is a building within which the stages of a multistage rocket are brought together before the assembled stack is rolled out to the launch pad or space launch complex and raised into a vertical position for final integration and launch. (U.S. Air Force photo by Senior Airman Aubree Owens)

VANDENBERG AIR FORCE BASE, Calif. --