I just found something, you may want to research.
It says that for the first 3 weeks, Kerry was on PCF-94, then on SB #44.
Perhaps in those first 3 weeks in December was when Alston served with him. We just need to make sure of the facts.
This is from an encyclopedia on the web:
http://www.wordiq.com/definition/John_Kerry#Military_Service_.281966-1970.29
Ten days after returning, on June 16, Kerry was promoted to the rank of Lieutenant Junior Grade; on June 20, Kerry left the Gridley for special training at the Naval Amphibious Base in Coronado. After completing swift boat commander training on November 17, Kerry reported for duty at Coastal Squadron 1 of Coastal Division 14 at the Cam Ranh Bay in South Vietnam, arriving on December 1.
Kerry's tour of duty as commander of a Swift Boat
During the first three and half weeks of his four month tour of duty as a boat commander, Kerry led a Swift Boat Patrol Craft Fast-94, patrolling the coast on Swift Boat #44 until late January 1969. After this he served on Swift Boat #94. "
They also have that picture, with explanation: "Kerry (far right) with four of the five men who served under him on Swift Boat Patrol Craft Fast-94."
Anyway, check it out -- better now, than to have the other side bring it up.
Plus Kerry has removed his claim (lie) to serving on the PCF during the mission that resulted in Peck's serious injuries, etc. That lie went away pretty easy, not much (but not zero) media attention.