SG2: Beginner's questions

I've only played the game once, so if the answer is RTFM, well, just put
that in personal e-mail.

1) After failing a reaction test, you can't take that same test again
until the next game turn.  So, if you fail the reaction test to start 
a charge, you can't attempt further charges that turn.	If you succeed
in
a reaction test, may you repeat it (eg. charge on subsequent
activations) ?

2) Is there a limitation to how many times a unit may be activated in
one
game turn ?  
Example: Company commander activated.  Transfers to platoon commander,
who 
transfers to two squads.
a) Can those squads also receive transfers from the Company commander in
his
second action ?
b) Can the platoon commander transfer again to the squads during his
normal
activation ?

3) Are guns limited to firing once per activation or once per game turn
?

4) Does a vehicle mounted infantry support weapon roll three dice
(Support
 firepower, quality die, fire control die ) ?

5) What is considered normal armor for a building or terrain feature ?

Tom