The US contribution to the Phase I upgrade of the Large Hadron Collider (LHC) at the European Organization for Nuclear Research (CERN) consists of the design and fabrication of specialized equipment by US DOE laboratories. The contribution through the national laboratories is called the Accelerator Project for Upgrade of LHC (APUL). The US contribution will enable a projected two- to three-fold increase in LHC luminosity. Furthermore, participation in the upgrade offers the U.S. the opportunity to benefit from its previous investment in the LHC, and enables it to continue developing novel techniques and analysis tools leading to additional important discoveries expected from the upgrade.