For the realism: "Operation Flashpoint".
Realistic weapons effects and gameplay, and you climb your way from a private to a company commander.

For the fun: "Battlefield 1942, Desert Combat mod.."
Playing against 64 other human players, with MLRS and M109 is good stuff for a redleg like me! 8)

The fire is everything, the rest is nothing!
"War is hell" (A hell lot of fun.... )
Hm, I need some artillery smilies....

Hmm, to be honest I really like the old turn based stradegy games like Civ II and the internet downloadable "Wacht em Rhine", which lets you play as either Allies or German in a turned based battle scenario in The Ardeness offensive.

Flashpoint was kinda hard to control the one time i played it, but seemed accuarte as far as military went. I do very much like the new Delta Force: Black Hawk Down game though.

Day of Defeat mod for Half-Life or Medal of Honor: Allied Assault.

well, for absolute realism... It was Red Storm Rising. i admit, it had hokey graphics..and it made you do the sonar operator, commander, and tactician jobs of a submarine...but boy life could get interesting when that torpedo came out of no where and the counter measures dont work and ....

Wolfensten: Enemy Territory becuase it is free and has quite a bit to offer for a free game. I also used to have fun playing Diplomacy and Panzer General is a classic.

Wolfenstein is ok but i prefer Medal of Honor and most allies vs Axis on Gamespy, Vietnam is pretty good, and Call of Duty is excellant

Conflict Desert Storm Back to Baghdad

I love the Medal of Honour games for PS2 - I know its not computer - but close enough. I bought it quite a while after it came out and am still amazed at the graphics, especially at the opening scene - storming the beach at Normandy. At a quick glance, you can't tell it isn't Saving Private Ryan.

I am waiting until I finish this to get MOH: Rising Sun.

I also like SOCOM for PS2, mostly for the awesomely realistic control - in my opinion. And the headset is cool.

The Rainbow 6 series

My all time favorit is Close Combat II: A bridge too far.
I also like Rainbow Six, Ghost Recon, IAF(FS).