A model-scale naval surface combatant, DTMB 5512, is studied experimentally in steady forward speed and regular head waves with the Iowa Institute of Hydraulic Research (IIHR) towing tank facilities. Unsteady resistance, heave force, pitch moment and free-surface elevations are investigated with different measurement systems for a fairly wide range of test conditions. Test data are procured for validation of Reynolds Averaged Navier-Stokes (RANS) computational fliud dynamics (CFD) codes and for understanding the physics of unsteady ship hydrodynamics. Uncertainty assessments are completed following the AIAA Standard. The results and discussions for the forces and moment cover the time mean values, added resistance and linear and non-linear responses. Results of free surface elevation tests include reconstructed unsteady wave patterns, diffraction wave patterns, and free surface turbulence distributions.