Hint: Legendary Medals
Current Rating: Not Rated
In your profile's options, your career statistics lists the medals and awards for that profile. If you successfully perform a specific task to earn a particular award 64 or more times, you will permanently unlock that battle bonus for that profile.
The easiest way to do this (apart from saving the profile after each battle, win or lose) is to enter the single-player training level and perform those tasks repeatedly. The training stage is one stage you cannot lose in and have infinite respawns. Stop short of taking down the droids with Mace Windu or taking over the final enemy bunker and you have literally all day to complete your tasks.
For the demolition award, it may be easier to play as a Rebel on Hoth and attack the underside neck of Imperial AT-ATs.
Your job's stock weapon will be your default choice when you change jobs at a command post. Although you can use it initially, if you switch to the award weapons, you cannot switch back unless you change your job.