The viruses attacked the DOS on the systems and the impact on commands ranged from none to one day downtime. Although one command reported not having a scanning policy prior to the infection, since the infection, they're using a variety of virus scanners. There were 642 computers at these locations, of which 1-2 percent were infected during the past 12 months. There doesn't appear to be a DoN policy requiring scanning computer systems prior to introducing media. Not all commands maintain records of attacks, time to repair infections and cost.
Employees bring disks from home without scanning for viruses.