.mil is for "Military" which is a Generic Top Level Domain (gTLD) - Not associated with a country. However, registrants are limited to USA.

Root: ICANN
Registration web site: http://www.nic.mil/
Whois server: whois.nic.mil
Whois web interface: http://www.nic.mil/dodnic/
Second Level Domains Registered

Domain Registration Rules:
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Warning: include(/home/linksale/domain/local_require/local_mil.txt) [function.include]: failed to open stream: No such file or directory in /home/wreile/whois-includes/whois-mil.php on line 19

Warning: include() [function.include]: Failed opening '/home/linksale/domain/local_require/local_mil.txt' for inclusion (include_path='.:/usr/share/pear') in /home/wreile/whois-includes/whois-mil.php on line 19

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Warning: include(/home/linksale/domain/other_require/other_mil.txt) [function.include]: failed to open stream: No such file or directory in /home/wreile/whois-includes/whois-mil.php on line 20

Warning: include() [function.include]: Failed opening '/home/linksale/domain/other_require/other_mil.txt' for inclusion (include_path='.:/usr/share/pear') in /home/wreile/whois-includes/whois-mil.php on line 20