In 1964, the HARP gun on Barbados continued to primarily launch Martlet 2 missiles that carried a wide variety of payloads. Part of the reason was its low cost, since the firing of the Martlet 2 cost from $2500 to $3000 and took only half an hour to load. The new results from HARP convinced the U.S. Army to increase the annual funding of the project from $250,000 to $1.5 million per year. By March 1964, Canada's Department of Defence Production (DDP) agreed to provide joint funding for the HARP program for a total of $3 million per year. However, funding for HARP reportedly faced several obstacles in the form of bureaucratic sabotage due to opposition in the Canadian government. The funding promised by the DDP for July 1, 1964 to June 30, 1965 did not arrive until May 1965. During this period, McGill University covered the funds to the best of its ability, although changes had to be made to the original plan. For each of the subsequent funding periods, the DDP repeatedly delayed funding for HARP late into the fiscal year.