Lee, I'd assume the usage of Actions for clearing Jams to be identical to those for Reloads.
Thus from p15 of v2 of the rules, for Actions:
Each Soldier has two Actions per turn. Soldiers (and players)
work as a team during the Soldier Turn. Players are free to act
as they choose. There is no set order to the Actions performed
or the Soldiers who perform them.
A Soldier can use 1 of his Actions to:
Reload - Remove an Empty Ammo counter from a Weapon. If
the Weapon has another Ammo counter, the Weapon is
Reloaded and can be used.
Other Soldiers cannot use their Actions to perform these
Actions for you.