The company also said it would cut 1,500 additional workers.
Only those without orders had to show up the next morning to see what additional workers, if any, were needed.
The company declined to estimate how many additional workers would be covered under the new plan.
But each year, there are more retirees taking money out, and not enough additional workers to support them.
An additional 700 workers would be hired for the truck line.
The center would need an additional 6,000 workers for the late-night shift.
Some additional American workers will be idled for at least a few days.
The plan calls for an additional 1,031 military and civilian workers to be hired in that period.
At least 78 additional workers were also injured on 16 August.
An additional 675 workers are carrying out 24 laws that were not on the books in 1980.