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The first one was actually pretty close to the book. It's near the end that it goes it's own way.
It's not actually anywhere close to the book. The book is dependent on a cold war setting, with the events spiraling out of Vietnam and conflict with Russia. In the book, Bourne was not actually an assassin, but was a fake assassin, created to root out the infamous (And actually real) assassin Carlos the Jackal by creating a rival. Or something like that. Plus the books were really violent, Conklin played a much bigger role, Marie was Canadian, Bourne was in his 50s and already had a wife and kids who were killed during the Vietnam war...
All sorts of things were cut out of an excellent and original book to create a decent, if not standard spy thriller. And then there are the sequels...
But yeah, from what I remember, First Blood could easily be a PG-13 movie. It wasn't all that violent.