For those that are thinking about trying to play through COD2 on veteran (I recommend it to anyone) I would like to point out a few things that I took away from the experience.
Some notes on gameplay:
1) On veteran this game is hard. I don't care how skilled in FPS you are (I have been playing FPS since Wolf 3D rocked the 386.)
2) Expect to die a lot. By the time you are done you will have all the death quotes memorized. You are extremely lucky if you can take more then two shots without dying.
3) The game is very fun on veteran... most of the time. There are parts that are extremely frustrating and will take you to the edge of hating the game.
4) The game will get cheap shots on you. While skill plays a large part in completing the game on veteran luck also plays a large part.
Some notes on strategy:
1) The number one thing to remember is that you have to take every chance to advance you can. Advancing is key. Your men usually will not advance until you do. In a lot of scenes the Germans can throw an unlimited supply of men at you. They will continue to spawn and attack until you advance. This can cause you to get stuck on a scene for a long time.
2) Speaking of scenes... the game is different on this skill level. While playing on regular makes this game feel more like a running action game it becomes a scene based game on veteran. The reason is that you can spend a considerable amount of time on different parts through each level. You will realize that things are setup to happen in a certain way with only slight variations.
3) A big key is to keep yourself from getting too frustrated. YOU WILL GET THROUGH THE PART. On a lot of scenes it is almost required to die at least once. You have to realize the position of the enemy and a lot of times even the order that you need to take them out. There is also usually a correct order to how you move and where you move. A good example is on the last level when you get a checkpoint and almost instantly a tank will come around the corner and blast you. You will restart at that checkpoint again and again and it will seem like there is no way to escape the blast. But, if you run towards the tank and jump over some boxes in a certain sequence you can escape the blast and then plant your explosives. Regardless of how good you are at figuring out these scenes you will still get stuck on certain parts of the game where you restart the check point over and over and over. There are some scenes that only last a few minutes but took me an hour to complete. Stay calm!
4) If you are stuck on a scene try something different! A lot of times the problem is that you just can't keep from getting shot by a particular guy or something and you just need to get him before he gets you. But, sometimes you are doing the wrong thing and need to try something different. Sometimes the easiest route is not even the correct route. In one scene there was a very large open field with a lot of broken up houses along the edge of it. I was having a lot of trouble going the route you are supposed to go through the houses (which is the way all your men are going.) I decided to take out some gunners and hike tail across the field. I reached the other side by ducking behind some cover along the way. This caused the other men to blast their way through the correct route to meet me at the next checkpoint around the same time I got there.
5) In my opinion the easiest tasks were rigging explosives (whether it be on tanks or on guns.) The most difficult levels were the ones that required you to capture multiple buildings. These missions can take a lot of time and can be extremely frustrating. I found the easiest way to go through these levels was to take the buildings in letter order. Taking the buildings in a random order tends to stick you in a nearly impossible situation (there is no impossible scene in this game though some get very close.) You can go through the game in any order you like and still get all the GP. While I took it in order I would recommend saving the multiple capture levels for the end.
6) Any key character in the game (someone that gives orders or has their name used in the dialog) can not die. I watched the Captain on the American campaign take two shots in the head and keep running. If it is convenient using these guys for cover can make running from one checkpoint or cover point to the next much easier.
That is all I can think of for now. I hope this is helpful to anyone that wants to try to complete this game on veteran (do it... it is great!) If you have completed the game on veteran please post any tips you can think of that I may have not mentioned. Good luck!