Not sure why ...
Tested on both my iPhone 3g and 3gs (both using OS4), as well as iPad, using regular Safari browser on all of them. It operates fine here and views just as it would on a PC. ...
Milsurps.Com has also installed specialized support for three applications for portable phones. Forumrunner and Tapatalk are Apple apps for iPhone and iPad (check App Store for both "free" for tesing and paid versions of both), however, I personally prefer Forumrunner, as it looks and feels more natural to me when using it. I also use BerryBlab for RIM Blackbery devices. All work well, of course, within any limitations those applications do to translate functionality. Search for them on Google.
Finally, a really nice "quick and dirty" text interface that is terrrific for speed, but lacks the graphics bells and whistles, is our Mobile device interface. It's also terrific for regular PC users who are on slow connections such as the old 56kb dial-up access. When you are on your iPhone, Ipad, Blackberry, or almost any PDA phone, Look at the very bottom left corner of the web site and select Mobile and you'll see what I mean. To switch back, select Full Graphics Mode at the top of the screen.
If I can help you with any testing, please send me an email.
By the way, it looks fantastic and is realyl fast on my iPad (3g/wi-fi with 64gb) ..
Regards,
Badger
Edit: Forgot to mention that Forumrunner supports the iPad in full screen native mode.