Here is a little update:
Yesterday, and also today, I searched the internet for some useful sounds. So far I have gathered around 6mb of sounds. It can be quite fun to listen to all those sounds. I also found some nice sounds to replace the standard windows ones. But I have enough of it now. Today I spend most of the time trying to do the fortify sound, however, with little success. The quality of what I can record is for some reasons very low (although I did buy a new microphone some months ago).
I remembered that Quake3 also has some nice sounds (basically everything you want). As it stands now I use a part of the Sarge taunt for the fortify animation.
The death sound will be equally difficult, but Quake3 also has some good choices there. I will try to use only parts of the original sounds and edit them in some way so you don´t get any unpleasent déjà vus if you already played Quake3.
Most of the sounds I downloaded are for the two victory animations. I also found some military fanfares on sounddogs.com. They only sell sounds but they also have low-quality previews of all sounds which you can listen to. I downloaded those previews and converted them to the wav format. I´m not sure if it would be legal to use the sounds according to their license, so I will send them an e-mail and hopefully they respond before the weekend.
Anyway, I also found some nice laughing sounds, which I will use for the primary victory sound of the parachutiste.
Unfortunately I didn´t find any good "whoohoo"/"yeah" sounds.