Way too many to list ! Computers virtually run the military now. I'll put a couple of sites for you to read but it's too broad a question to really answer.
The Impact of Computers on Military Management and Command
V25N2 - The Impact of Technology on the Military : An SAF Perspective
You have the Military to thank for the Internet . . . I believe ARP-net was created for the military for communications purposes, and it was the beginning of the internet regarding Data and packet delivery.
Without this first achievement, I am sure someone would have come up with something similar but maybe no Blurtit.com . . . ;)
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