Long Term Availability – Military programs last years and identical replacement hardware may be required over the life of the program. Consumer computers are often driven by the latest and greatest to realize the highest possible performance, such as required to play games. The motherboard in a consumer grade computer may have an availability measured in months instead of years or decades. In a consumer level computer, over the lifetime of the product availability, it is not unheard of for all the components such as the motherboard, drives, BIOS, video board, etc., to be different from computer to computer. That is not acceptable in a military computer for which supporting documents have been created and systems tested and approved.