Hello Paul,
To answer your questions from my knowledge:
Theoretically it was not difficult but of course the most suitable and best soldiers have been preferred! I receive most of the possible decorations starting with the the jump badge, the qualification badge (don't ask me in what i've done this but i think it was for LMG = Light Machine Gun), the Schuetzenschnur (don't know how you call it in English), Sport badge and in an separate occasion i received the "Best Soldier" (or something like that) badge from the North Korean army! (I'll post a picture when I'm back in Greece). Sorry that i don't know the names of all these badges in English.
No, officially we where not allowed to keep our Uniforms, but most of us have been clever enough to "organize" their own during the time of service. At the end most of us have had a complete uniform at home then we left the Army.
The Berets where actually the same! The difference was the metal cockade. In the 80's the berets have been adjustable at the back - we actually did not like this version at all and everybody tried to get one from the older years. Getting one of them has often cost a fortune!
Yes we did have a Doctor in our unit who (if I remember) has worn the same uniform as all the other officers.
Kind regards,
Joerg