VAB meaning in Governmental ?

The Vehicle (originally Vertical) Assembly Building, or VAB, is a large building at NASA's Kennedy Space Center (KSC), designed to assemble large pre-manufactured space vehicle components, such as the massive Saturn V and the Space Shuttle, and stack them vertically onto one of three mobile launcher platforms used by NASA. As of July 2021, the first Space Launch System (SLS) rocket is being assembled inside, in preparation for the Artemis 1 mission.

At 129,428,000 cubic feet (3,665,000 m3) it is one of the largest buildings in the world by volume. The building is at Launch Complex 39 at KSC, 149 miles (240 km) south of Jacksonville, 219 miles (352 km) north of Miami, and 50 miles (80 km) due east of Orlando, on Merritt Island on the Atlantic coast of Florida.

The VAB is the largest single-story building in the world, was the tallest building (526 ft or 160 m) in Florida until 1974, and is the tallest building in the United States outside an urban area.