The external tank being lowered and leveled between the solid rocket boosters and platforms.

In the Vehicle Assembly Building at NASA's Kennedy Space Center, Payton Jones, an aerospace senior technician with United Space Alliance, stands on E platform on the 14th floor of high bay 3 as he monitors the external tank being lowered and leveled between the solid rocket boosters and platforms. The tank and rockets will be mated for the launch of Discovery on the STS-124 mission to the International Space Station, targeted for May 31. On the mission, Discovery will transport the Kibo Japanese Experiment Module - Pressurized Module (JEM-PM) and the Japanese Remote Manipulator System (JEM-RMS) to the space station to add to the Kibo laboratory. Photo credit: NASA/Kim Shiflett