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(A proofreader's note regarding “trooper” and “trouper”)

A trooper or trouper derives from a unit
Defined as a troop or a troupe;
The latter performers, alike formal soldiers,
Are led by a drive to not droop.

The term “a real trouper” came first within trouping, 
“Reliable as actor” its fact.
But when in the contexts of army, policing,
It's “real trooper” we favor for tact.

More often we see that not courage and bravery
In physical conflict is meant,
But “steady, resilient in times that are trying,”
With “real trouper” then the intent.