A video of Finnish volunteers fighting in Ukraine.
This is what your first combat mission would probably look like.
Really captures the SNAFU of the situation. Especially what the combat stress does to your thinking. You have weapon systems which you have not been trained to use. Any plan you had goes out of the window immediately. Your squadmate gets hit within first couple of minutes and your car gets destroyed.
Yeah... forget all those dreams about high-speed-low-drag operational operating.
Once your adrenaline and stress hormone levels peak, all sensible thinking goes out of the window. Even if you are decently military trained soldier, you suddenly can't think straight. You literally can't talk straight but rather communicate on a vocabulary level of Gorilla's "boots-and-banana". You can't even find your way out of farmstead courtyard. You try to blow up a hole into a corrigated steel fence. And most of your time you just end up wandering around trying to find some medivac for your downed pal (who, despite being hit in the sole of his feet, is certain he is going to die). And in the end, you didn't really achieve shit.
This is why previous combat experience is so important and why it makes such a difference. Why rookies get wasted so often. You have to be able to keep your head cool.
Adrenalin is a hell of a drug.