Battlefield 1942 was the first FPS I got really into. Its first expansion, Road to Rome, was meh, but the second expansion, Secret Weapons of WWII, added some really unique and exciting weapons and vehicles. I especially loved flying the Goblin and the HO-229 around harassing infantry and light armor.

Looking back on it, it's pretty and that they made an expansion focused around wunderwaffen weapons and a stand-in for the fucking SS. But damn if adolescent me didn't have hours of fun pew pew'ing around with a jetpack Don't worry I play less-overtly-fascist games now, like Helldivers II.