RN- Radar Nav- the left seat downstairs guy in the Buff. Controls bombs, missiles, radar and pod. Has no control over defensive stuff.
EW- Electronic Warfare Officer. Jams things, has no control over weapons.
WSO- Weapon System Officer- historically, the backseaters in Bones and Mudhens. About a year ago, AFGSC made the decision to relabel radar navs and navs as WSOs because "WSOs promote better because everybody knows what a WSO is but nobody knows what an RN is"....or so I was told.
The Striker Vista guys, coming from Bones, are versed in both offensive and defensive skill sets, but the Buff's EA suite is so much more man-in-the-loop than the Bone's that it'd be like teaching the guy Greek or something (wait, can I say that or is it offensive?) Skillset translates better putting him in the RN seat.
There, now you know more than you ever wanted to about the world of the 12B.