As part of the regular Army, WACs could not be permanently assigned as cooks, waitresses, janitors, or to any other civilian jobs. While most became clerks, secretaries, and drivers, they also became mechanics, weather observers, radio operators, medical technicians, intelligence analysts, chaplains, postal workers, and heavy equipment operators. The restriction against combat training and carrying weapons was waived in several cases, allowing women to serve as pay officers, military police, in code rooms, or as drivers in some overseas areas. On January 10, 1943 a 200-WAC unit was even trained as an antiaircraft gun crew, though they were not allowed to fire the 90 mm weapon. Several were also assigned to the Manhattan Project.