Trooper (noun)

1. A soldier, especially one on horseback or in a cavalry unit.
2. A member of a police force, especially one on horseback or in a motorcycle unit.

Origin:

The word 'trooper' is derived from the middle english word 'troupier' meaning 'horseman' or 'soldier'.

Examples:

1. The troopers were deployed to maintain order and prevent violence during the demonstrations.
2. The trooper was hailed as a hero for his bravery in rescuing the hostages from the armed kidnappers.
3. The trooper was part of a special unit trained in crowd control and handling civil disturbances.
4. The trooper was a seasoned veteran with many years of experience in law enforcement.
5. The troopers were a familiar sight in the city, patrolling the streets on their motorcycles.