Also, how does one use a radio properly then?
Think brevity and clarity; that's the key to good radio discipline. Identify yourself and who you are calling, i.e. 'Red One to Red Two', that sort of thing. Use the phonetic alphabet to spell stuff out if it's noisy. Most of the phonetic alphabet letters are more than one syllable (not all of them though) in order to make it clearer if a crackle or pop obliterates some of the sound. Also note that in addition to the regulation Alfa, Bravo, Charlie, Delta, Echo, etc for letters, numbers are pronounced differently than in normal speech in order to make them clear over a radio, so they go like this: Wun, Too, Tree, Fo-Wer, Fife, Six, Sev-Ven, Ate, Nine-Er, Zee-Ro.
Codenames should be two syllables in order to make them clearer through static and should not be anything confusing or synonomous with what they represent, since that would defeat the object of them being codewords of course. Thus, in the terrible movie Top Gun, Tom Cruise's character would never really have been allowed to use 'Maverick' as a callsign, since callsigns have to be approved, and the US Navy would never have approved a callsign which was the same name as the air-launched AGM-65 Maverick missile, which is in their arsenal of weaponry, since that might lead to confusion over the radio. In fact, to avoid confusion, US forces don't even use the word Maverick on the radio when they really are launching a Maverick missile, they use the codeword 'Rifle'!
Give your team a unit callsign and designate each member as a number, so if your team's callsign is 'Breadbin' for example, then you will have 'breadbin 1', 'breadbin 2' etc. The only deviation from this system is the leader, who uses the callsign followed by the word 'actual', so he or she would be 'Breadbin Actual'. The numbers are used in sequence when the leader wants a status report, so if Breadbin Actual requests ammo status, Breadbin 1 answers first, then Breadbin 2 answers, etc. Remember that 'Over' means 'I have stopped taking, and expect a reply', whereas 'Out' means I have stopped talking and do not expect a reply. Thus in movies when you hear people say 'Over and Out' they are talking utter b*ll*cks, and sound like total amatuers, because one is a contradiction of the other. If you need to communicate with two people quickly and the nessages are seperate commands, you use the word 'break', for example: 'Breadbin One from Breadbin Actual, move fifty metres east. Break. Breadbin Two, maintain overwatch on your position. Acknowledge.' Breadbin One would then acknowledge he understood by saying something like 'Breadbin one, understood, on the move.' then Breadbin Two would also acknowledge his order.
You can use other common brevity phrases such as 'Wilco' which means 'will comply', 'Roger', which means 'yes, understood', Negative, which means 'no' obviously, affirm, or affirmative, which means 'yes' (two rapid clicks on the transmit key is also commonly used to acknowledge stuff, or can also mean yes), 'Mike' means 'metre', 'oscar mike' means 'on the move', 'Winchester' which means 'out of ammo'. Google will turn up a lot of others for you if you wanna go all super authentic with code words.
Codewords are more common in everyday life than you think, for example, I was at St Pancras Underground Station a couple of weeks ago and heard 'Will Inspector Sands please report to the security office' being played repeatedly over the tannoy. Sounds innocent enough, doesn't it? In fact, most passengers on the platform were jokingly saying things like 'ooh, I bet he's in trouble', little realising that 'inspector sands' is code on the London Underground for a fire. Me on the other hand, was on the first train out of there lol. There are other codenames they use for bomb threats and such too, such as Mr Gravel and Mr Jones, so if you hear them on the Tube in London, get the feck out of there rapido lol.
If you have to report stuff, don't blurt out useless things such as 'look out, he's behind you!' because everyone who hears it will duck. Report it calmly, indicating who you are referring to. If you have to report a location, identify it from a landmark or location which everyone knows, and then give the distance in feet or metres, and bearing in degrees, assuming everyone knows which way north is (they probably won't), or if you are all advancing one way, you can use clock positions, i.e. three o'clock is right, nine o'clock is left, six is behind and twelve is in front etc.
If it's a WW2 milsim, you might wanna use the older phonetic alphabet, and be aware that this differed between nations, i.e. the Americans used Able, Baker, Charlie, Dog, Easy etc, whereas the RAF used Ace, Beer, Charlie, Don, Edward etc, the RN had Apples, Butter, Charlie, Duff, Edward etc. Needless to say this was confusing, so they now all use the ICAO/Nato one which most people know, i.e: Alpha through to Zulu.
Hope that helps.
Look at Motorola radios 
