The title of the book is in 2 inch lettering
Tom Clancy's name is in 2 inch lettering
the phrase: "With Peter Telep" is in ¼ inch lettering.
I would estimate Clancy's contribution to the actual text of the book as slight, and very noticeable. When descriptions of tech or weapons are in the book, it is clearly Clancy. The rest I attribute to Telep. I am about 550 pages (of 750 some). Faster paced than Clancy's novels. Entertaining. I like it. Telep has apparently 40 some books out, I'll have to find a few.
I would say Tom contributed more than just technical descriptions. At the launch of his imprint (The books starting with) Tom Clancy's Op Center I read an interview where he talked about doing character profiles and detailed outlines and handing it over to a writer to finish. He talked about how these original frameworks can sometimes be over 100 pages themselves, since it's the whole book scene for scene in a shorter form.
He's not the only one who works this way. There's Robert Ludlum's (like his covert One series), Stephen King's (cuz the last thing he wrote outright was Under The Dome) even Daniel Steele's.