Abstract : Three numerical simulation codes that compute the added resistance in waves, SWAN1, LAMP2 and VERES, are evaluated using model test data of the Joint High Speed Sealift (JHSS). The added resistance tests were conducted with the Model 5633-3 with the scale ratio of 34.121. This model has the JHSS conventional Baseline Shaft and Strut hullform with Gooseneck Bulb. The model was free to heave, pitch and roll. The model tests were conducted in regular head waves at two full-scale ship speeds of 25 and 36 knots, with Froude numbers of 0.24 and 0.35, respectively. The comparison between numerical simulation results and test data show that heave and pitch motions are well predicted by all three codes evaluated. For the added resistance, SWAN1, LAMP2 and VERES produced good agreement with the test data. SWAN1 produced the best predictions for the added resistance as well as the heave and pitch motions.