The Coast Guard will commission a new station in the port of Boston at 2 p.m. Thursday, Sept. 25, at the Coast Guard Integrated Support Command in Boston's North End. Mayor Thomas M. Menino will serve as the keynote speaker. The commissioning ceremony formally signifies the establishment of the unit as an official independent Coast Guard Station. For Station Boston, it is a return to an official status the unit held until 1996, when a realignment of operational forces throughout the Coast Guard downsized the station to seasonal operation under the control of Coast Guard Station Pt. Allerton in Hull, Mass. Immediately following the tragic events of September 11th…