Whenever the Driver can get ahold of a German AFV and wreak havoc on enemy troops.
For those who manage to get him to the tank without alarm in the last mission of Behind Enemy Lines, destroying the remaining troops of the castle with it is immensely rewarding and satisfying.
The Diver using a mini-submarine to destroy a new Bismarck battleship in Behind Enemy Lines.
Infiltrating The Wolf's Lair in Beyond The Call Of Duty. The Green Beret, the Driver, and the Sniper have to enter the complex, bust the Spy out, abduct Colonel Von Below, the facility's head of security, and escape in a Panzer. Oh, and they have to do it without setting off an alarm, or Von Below will bolt. One gets the impression that if they'd been sent to that very same place to take out Adolf Hitler (since this is the headquarters where he most often oversaw the Eastern Front of World War II), they'd just pull it off.
Men of Courage
The bonus mission after completing the puzzle from "Saving Private Smith"? Defending the half-ruined city against a massive German assault with the Commandos and playable Allied soldiers. It's the mission where the sapper has the most opportunities to use the bazooka and anti-tank mines, due to a number of enemy tanks supporting the assault.
The bonus mission after completing the puzzle from "Castle Colditz" consists in destroying enemy tanks with the Driver and Sapper piloting a Tiger tank.
Rampaging through the streets of Paris in a Panzer III, blasting the remaining enemies is incredibly satisfying after sneaking out of Le Métropolitain and over to the hotel to disable the explosives set to destroy the city.
Destination Berlin
The cinematics are a treat, especially Stalingrad being bombed by German planes (and the Green Beret lifting and firing a MG42 machine gun to down one) and parachutists dropping there, a German parade in Berlin and the D-Day beach assault under a rain of bullets and mortar shells.
Assassinating General O'Donnell in the middle of a heavily garrisoned Berlin in early 1943. There are three recommended methods: Snipe him (from two possible positions), poison him by getting close with the Spy, or having the Sapper leave a remote control bomb by where his car parks and blowing him up.
Strike Force
It's difficult, but it's possible to rescue the Russian Soldiers about to be executed via firing Squad in "Trapped", with the Spy managing to one-man-army a decently large group of German soldiers to do so.
