It was in the Congressional Record January 28, 1998.
Try this site for a link. I tried it but am having trouble with the pdf file.
http://beldar.blogs.com/beldarblog/2004/08/kerrys_belodeau.html
From
http://thomas.loc.gov/cgi-bin/query/F?r105:1:./temp/~r105SbPlnD:e45:
If the link dosen't work, go to thomas.loc.gov and you can search the 105th congress for
THOMAS M. BELODEAU (Senate - January 28, 1998)
Kerry-
"There was the time we were carrying special forces up a river and a mine exploded under our boat sending it 2 feet into the air. We were receiving incoming rocket and small arms fire and Tommy was returning fire with his M-60 machine gun when it literally broke apart in his hands. He was left holding the pieces unable to fire back while one of the Green Berets walked along the edge of the boat to get Tommy another M-60. As he was doing so, the boat made a high speed turn to starboard and the Green Beret kept going--straight into the river. The entire time while the boat went back to get the Green Beret , Tommy was without a machine gun or a weapon of any kind, but all the time he was hurling the greatest single string of Lowell-Chelmsford curses ever heard at the Viet Cong. He literally had swear words with tracers on them! "
Note that Kerry claims is was HIS boat that was blown 2 feet out of the water...and noone was injured except he bumped his elbow...