I thought MR4A had at least 1 WSO on board, and same with the Sentinel R1?
Guitarwillie - pretty much as PN says. Whilst the MRA4 plot is probably already sorted given the number of WSOs already in the system, I wouldn't pin too many hopes on the Sentinel - or even the SKASaCs come to that.
The Sentinel fleet is tiny - I believe only 5 ac total, with only one or 2 on ops at any one time - and there are only 3 mission crew down the back. Of those 3 mission crew, 2 are Imagery Analysts with the 3rd being a Mission Commander. The MC would more than likely be a WSO but I would hazard a guess that you might also get the odd AEO filling a slot too - I believe a recent V(AC) Sqn boss was an AEO.
Then again, if you were feeling very brave or speculative, you could always go FC and pray that the RAF follows the USAF route and makes all its Sentinel mission controllers FCs as per the USAF's JSTARS
