a) What is the definition of commonlaw for the CF
The definition for a common law spouse through DND is the same as the rest of Canada. With the CF, you have to wait 1 year before being able to "sign the papers" to officially make you common law.
b) What is the process for declaring yourself commonlaw
Well there is a form that both you and your partner have to sign which is then givent o your command
c) What proof/documentation must be provided
We were not required to give any back in '99, but by what i have heard, anything will do as long as both your names are on it.
d) what additional benefits do you receive (in a deployed overseas context)
You will receive the same benefits as a married couple, such as separation pay etc
e) I have heard that your HLTA allowance may only be applied to your own expenses, or that of a wife/commonlaw partner.
It is used to get you to your next of kin, or whomever is on your PEN form, be it your mother, father or spouse(common law or otherwise)