A person who is actively performing their job as a law enforcement officer at a particular time

कर्तव्य पर तैनात अधिकारी

English Usage: The officer on duty was quick to respond to the emergency call.

Hindi Usage: तैनात अधिकारी आपातकालीन कॉल का तुरंत जवाब देने में सक्षम था।