Congratulations Rob, you did indeed get the 500k post here!!
http://www.military-quotes.com/forum/503969-post.html
But it's really post #503.969 since we've deleted quite a few posts in here over the years..
Here's some flashbacks of the Milforums "glorious" history...
January 18th, 2003. just a few weeks "old": http://web.archive.org/web/200301181...orum/index.php Our users have posted a total of 6 articles
We have 3 registered users
December 4th, 2003. Almost a year "old"..
http://web.archive.org/web/200312040...orum/index.php
Our users have posted a total of 1021 articles
We have 91 registered users December 16th, 2004. 2 years "old" http://web.archive.org/web/200412160...orum/index.php 73191 articles on the forum
2586 registered users
October 29th, 2005. Almost 3 years "old" http://web.archive.org/web/200510291...orum/index.php 155660 articles on the forum
4188 registered users
December 31th, 2006. 4 years "old"
(the template/style is messed up due to a non-archived CSS file)
http://web.archive.org/web/200612311...tes.com/forum/
Threads: 30,303, Posts: 280,269, Members: 3,216
December 14th, 5 years "old"
http://web.archive.org/web/200712141...tes.com/forum/

Threads: 48,889, Posts: 382,482, Members: 4,231
(A lot of inactive accounts has been deleted at this point)
And today!! A bit over 6 years old
Threads: 72,565, Posts: 500,052, Members: 7,214
The total number of members would have been 9.553 right now if I hadn't deleted inactive accounts....
More from Archive.org:
http://web.archive.org/web/*/http://...orum/index.php