Hydro Soak:
A site run by a good friend of mine
with a strong millitary basis. SSX's Brother site

Non-Military Based:

Isoaker.com :
A Humongeous site,
run by one of the founders of Aquatica.
Really good reviews, great tactics, and a
really good navigation system.

Aqua-Nexus:
A really big site. Tactics are not plentiful,
but the reviews are great, and there's alot of them too.
The navigation Rocks, and it goes into deep detail.

Other:

Aqua Labs:
A really nice, cleanly done site. Bringing
you the first Real water gun sniper rifle.
A exellent site.