"They will not be allowed to prearm the weapons at this point.

The US Forest Service tested chitosan as an ecofriendly biopesticide to prearm pine trees to defend themselves against mountain pine beetles.

Once programmed with the correct prearming code transmitted to the crew by the National Command Authority- the President of the United States, along with the Secretary of Defense-the PAL would allow the crew to prearm the nuclear weapons.

Additional safety was added by providing a single, physical, positive action to any attempt to prearm any nuclear weapon, such as breaking the thin steel safety wire off the lock lever before moving the lock lever over so the anning switch could be moved from SAFE to ARM.