Based on examination of Kerry's journals and logbook, historian Douglas Brinkley placed the covert missions soon after Christmas. In an interview with the London "Daily Telegraph", Brinkley stated that Kerry had gone into Cambodian waters three or four times in January and February 1969 on clandestine missions, dropping off U.S. Navy SEALs, U.S. Army Green Berets, and CIA operatives. Brinkley added, "He was a ferry master, a drop-off guy, but it was dangerous as hell. Kerry carries a hat he was given by one CIA operative. In a part of his journals which I didn't use he writes about discussions with CIA guys he was dropping off."