Comment I think you are misreading the 440,000 (Score 3, Informative) 50
The 440,000 would be employees and volunteers of the VA. The VA itself actually handles a lot more than that. There's 21.5 million veterans, of that 3.5 million receives disability compensation. Every veteran is eligible for health care in the VA system. So for 444,000 users of the VA information technology, 900,000 devices isn't that far fetched to handle the date for 3.5 million + veterans.
http://www.infoplease.com/spot/veteranscensus1.html
http://www.va.gov/opa/publications/factsheets/fs_department_of_veterans_affairs.pdf