No. Somebody doesn't have to go, for most wars, and certainly not for the wars the US has started recently. Existential threats may require war, but the US doesn't face any right now.

No, nobody has to go, there's no actual need for war unless actual soldiers come marching on your homes. Which has like NEVER happened in the US (and who would dare anyway!). And it's not like US Allies are in deep danger either. Most of the current wars are of the "preventive" nonsense type.

"Sometime they'll give a war and nobody will come"

~ Carl Sandburg