the feeling that you should do something because it is your duty: For Anne, the call of duty was strong. These heroes courageously answered the call of duty. Fewer examples. The doctor faithfully followed his profession, never hesitating to respond to the call of duty.

The Call of Duty series games are made in IW engine by Infinity Ward. You probably would've seen the name when you start any COD series game. Almost every game shows the game engine which it is built in. The IW game engine uses c++.