 The Z1 truss's MBM was used only once, to temporarily hold PMA-2, while the "Destiny" lab was being berthed onto the "Unity" node during STS-98.Since the installation of the nearby S0 truss in April 2002, access to the MBM has been blocked.In October 2007, the P6 truss element was disconnected from Z1 and moved to P5; P6 will now be permanently connected with P5.