@marcos, no. For example CSAR an A-10 would be OSC. Therefore he would tell the CAP aircraft when he is ready to go in rather than letting them go in ahead and do their own thing. The OSC manages a rescue. (How it's described in A-10's over Kosovo anyway) and if I understand what OutOnTheOp is saying.
http://en.wiki.eagle.ru/wiki/Virtual_Squadrons_and_Regiments
Here's a list of squads. Check a few of these out. There's also various open servers. Going ugly is a good one.
Download and install this first:http://www.digitalcombatsimulator.com/index.php?ProductId=21&end_pos=137&scr=product&lang=en
Then this:http://www.digitalcombatsimulator.com/index.php?scr=product&ProductId=8&end_pos=136&lang=en
At some point buy A-10 through this link: (scroll down a bit) http://www.digitalcombatsimulator.com/index.php?end_pos=1322&scr=shop&lang=en
You'll need an account to buy the game and this is the most recent version. When you buy the game you should recieve and email with the serial number. After installing both things above fly a mission with the A-10 and you will be asked for your serial number. Put the number in there and you're done.
Hope this helps.
My preferred idea (needs a lot of switching to be fair.)
Tanker on it's own freq VHF AM. Prefer to keep it separate
AWACS on a "common" frequency. VHF AM Everybody monitor
Each (playable) flight on different UHF
Each JTAC on their own frequency usually FM
AI flights on AWACS frequency. (Possibly not realistic but the engaging calls can be useful.)
Hope this makes sense.
Carry on downloading DCS world (check it's 1.2.1). Then assuming you want the english version of P-51 download the file from the link below, (a few hundred mb I think.) Once it's downloaded install DCS world and then the file below. If you're wondering DCS world is the core and the file from the link contains the P-51D specific parts like the cockpit.
http://www.digitalcombatsimulator.com/index.php?scr=product&ProductId=18&end_pos=136&lang=en
The coloured portion of the boom is non collidable, Presumably to make it easier when training.
@Hoggorm, plenty have a look in missions and campaigns section.
http://forums.eagle.ru/showthread.php?t=79126&highlight=Refueling