Wondering why the End Zone Militia didn’t take part in the Patriots’ duck boat rally? They weren’t invited. The gang in the Revolutionary War garb had been involved in three of the team’s previous four Super Bowl celebrations, but not this time. “We were told they didn’t have enough authorized vehicles,’’ said Geoff Campbell, the captain of the colonial crew. “So I’m warm and dry at home, but we’d rather be out there with the team.’’ It’s not clear whose call it was to keep the End Zone Militia on the sideline, but it didn’t sit well with Campbell. At the duck boat rally after the Pats’ Super Bowl win two years ago, the militia marched in front of the lead duck boat. “We said we didn’t need to be in one of the [duck boats], we could just march or meet the team at City Hall Plaza, and we were told, no marching, no nothing,’’ said Campbell. “This is a vast disappointment.’’