Fermilab operates large clusters of computers for Lattice Quantum Chromo Dynamics (LQCD), as part of the national computational infrastructure for Lattice QCD established by the Department of Energy Office of Science. Their goal is understanding the strong dynamics of quarks and gluons, which is beyond the reach of the traditional perturbative methods of quantum field theory. A central goal of the collaboration using the computers is the accomplishment of the calculations required to extract from experiment the fundamental parameters of the Standard Model of particle physics.