60B is pretty hefty, although the WSM is supposedly going away, being abosorbed into NATOPS and the Techman and TACMAN.
We got issued the WSM with out NATOPS when we checked in, and I'm glad I've got it for the ATO phase. They're not issuing it anymore, but the new NATOPS that just came out doesn't have sh!t from the WSM in it. Not sure where it went, but I'm still using the WSM on a daily basis.