By heating timber to a certain temperature, it is possible to eliminate the presence of pests found in wood. Heat treating is also an alternative to chemical preservatives, as many consumers would prefer chemical-free timber preservation methods.
The Commander is a character in Call of Duty: Heroes. He may occasionally visit the player's base if they have built the Landing Zone. He will ask the player to escort him to a Deployment Yard...
Just like the Army, the unit commander is the promotion authority for promotions to Airman (E-2), Airman First Class (E-3) and Senior Airman (E-4). As long as a person doesn't get into trouble, and does their job satisfactory, promotions up to E-4 are automatic, based on Time-in-Service (TIS) and Time-in-Grade (TIG).