One chapter of SBVT's "Unfit for Command" questioned Kerry's statements that he was in Cambodia during the war. Kerry did not claim to have been sent on a covert mission to Cambodia on Christmas Eve, 1968. Rather, he believed at the time he had crossed the border while on a patrol near the border, during which the boats were ambushed and later came under friendly fire from South Vietnamese soldiers. None of Kerry's crewmates confirmed being sent to Cambodia. One of Kerry's crewmen, SBVT member Steven Gardner, asserted that it was physically impossible to cross the Cambodian border, as it was blocked and patrolled by PBRs (a type of patrol boat); however, Kerry's boat was evidently patrolling with PBRs during the mission in question. Some crewmembers have, moreover, stated that they may at some point have entered Cambodia without knowing it. James Wasser, who was on PCF-44 on that December mission, while saying that he believed they were "very, very close" to Cambodia, did not recall actually crossing over; he also stated that it was very hard to tell their exact position in the border area. Kerry's own journal entry on this, written the night of the mission, does not specifically say they entered Cambodia. However, it does state that PCF-44 was somewhere "toward Cambodia" to provide cover for two smaller patrol boats, and in sarcasm, that he considered messaging Christmas greetings to his commanders "from the most inland Market Time unit" and that a court martial for the incident "would make sense" In addition, George Elliott noted in Kerry's fitness report that he had been in an ambush during the 24-hour Christmas truce, which began on Christmas Eve.