First off, you need to know that for Weapons, Surveillance or Space you need particular aptitudes, which are different for each role. To generalise, Weapons Controllers are usually in charge of up to 4 aircraft and have to make decisions about the safety and conduct of those aircraft very quickly, with very little information. A Surveillance Officer typically has to deal with lots of different information, coming at them from different sources and systems and quickly fuse all the data and information to come to a correct solution. A Space operative's aptitude needs to be broadly similar to a Surveillance Officer's, but the job is subtly different.
So, as a Surveillance Officer, once qualified you'll typically start your career as an Identification Officer (IDO) working in one of our Control and Reporting Centres (CRC), either at RAF Boulmer, or RAF Scampton. If you're at Boulmer you work a shift system, which means either a 12-hour day, or night, depending at which part of your cycle you are. During your shift you'll spend several periods on console in charge of producing the Recognized Air Picture (RAP). It will be your responsibility to make a threat assessment on every aircraft in your area of responsibility and assign it a category during that time. This is quite a big deal. During conflict the RAP is what our commanders use to make their decisions on which aircraft to engage. To put it another way - if a 9/11 situation happened in the UK, the IDO is the one who has to locate that aircraft on their RAP and assign the correct category. If it is a 9/11 scenario, commanders in the CRC will scramble live armed fighters to intercept and potentially shoot down a passenger airliner. If the IDO gets it wrong and has given the category to the wrong jet, they are ultimately responsible for a 'blue-on-blue', or in this situation, an immense tragedy. So there's a lot of responsibility! Don't worry, there's plenty of training before you get to this stage to make sure you get it right! That includes exercising the 9/11 scenario. During a shift you'll make this threat assessment hundreds of times and it becomes second nature - you'll get very good at spotting odd behaviour and flagging it to your commanders.
When you're not on console, you'll spend your time being an officer. You may work on your secondary duties - these are things outside of your main role. So, for instance, it could mean organising what's now called Force Development for your troops and colleagues. This could be something like a team-building day where you go white-water rafting, to organising a four day exped to Wales for 40 people, which is what I'm doing at the moment. When you've been qualified for a while you may also become a Deputy Flight Commander and be in charge of a Flight along with a more experienced officer as the Flight Commander.
Space Specialists are normally drawn from a Surveillance background, so you may have completed a tour, (also called a posting; they usually last 18 months to 2 years) before moving across streams. You'll be based at RAF Fylingdales as a Watch Commander. Your job there is to run a Watch of 4 personnel and to maintain the Space Picture as part of the US Ballistic Missile Early Warning System. Essentially, you have 60 seconds to detect, track and classify a launching object and then report it up the chain. We use what's called the SSPAR (Solid State Phased Array Radar), which has a range of 3000 miles, to do our bit. You'll be on a similar shift system to an IDO and outside of your normal working role you'll do your additional duties as Watch Commander, like reporting on your troop's performance and looking after their welfare, as well as other Secondary duties like I described above.
There is more to it as well and lots of different roles to progress into, but I'm banging on now! Feel free to ask more questions.