Update for everyone. I finally ran into a reporter who is genuinely interested in this story, i.e. why did Lehman sign Kerry's citations??? (My earlier correspondence with the Boston Globe's Kerry-guy led nowhere.)
This reporter said he'd noticed the signature back when the citations were first posted on Kerry's site. But he never took the trouble to compare those signatures with Lehman's and Chafee's...and then he forgot about it. He asked if I could provide him with a sample of those signatures. SC Swamp Fox gave me permission to give him Swamp Fox's unit citation from 1986 signed by Lehman. I also provided him with the samples of Chafee's signature from these pages.
His next step will be to approach Lehman and have him confirm it's his signature on the Kerry docs. Once confirmed, I would assume he would go to the Dept. of Navy and request all documents related to Lehman's signing of the citations. Fingers crossed.
Hold your breath...this guy seems to smell a story. I'll keep you informed.