07-12-2008, 04:50 PM
I found a reference for the 2756th ECB, looks like the unit was formed from part of the 1st Engineer Amphibian Brigade, or 1st Engineer Special Brigade.
It looks like the 591st Engineer Boat Regiment evolved into the 1185th Engineer Combat Group and later the 591st Engineer Combat Group
1185th / 591st Engineer Combat Group:
2755th ECB
2756th ECB
2759th ECB
This info was found on a 591st 2001 reunion page: http://www.armyamphibs.com/html/1esb_meetings.htm
found on the site: http://www.armyamphibs.com/html/1st_esb.htm
Hope this helps, i`ll see what else i can dig up.