Ordinance factories manufacture equipment for the Defence Services. The Indian Ordnance Factories Service (IOFS) officers serve in these factories for a span of nearly 10 years. They may be asked to serve as commissioned officers of the Armed forces for 4 years. At the apex of the IOFS is the Chairman equivalent to a Secretary, followed by Members of the Ordinance Factories or Director General Ordinance Factories and then by General Manager. The senior and junior scale positions are like the other services.