the.com/trooper

Someone who keeps marching after everyone else would've quit and complained.

means A person who endures hardship or setbacks without fuss and just keeps going — also, literally, a soldier or mounted/state police officer.

from Rooted in 'troop,' from French troupe (a group of soldiers), ultimately from a Latin/Romance word tied to a 'herd' or 'flock.' A 'trooper' was originally a cavalry soldier — hence the phrase 'swear like a trooper,' from the rough, hard-bitten reputation of soldiers in the ranks. The sense of 'uncomplaining, tough endurer' grew out of that soldierly grit, especially in the phrase 'a real trooper.'

origin
soldier in a cavalry unit, originally
phrase shift
real trooper now just means uncomplaining
state trooper
US highway cops borrowed the cavalry swagger
not blooper
commonly confused with trouper, the stage version
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