What is the appropriate greeting when reporting to an officer during daytime?

The appropriate greeting when reporting to an officer during the daytime is "Good morning, sir/mam." This greeting is both respectful and professional, aligning with military customs and courtesies. Using "Good morning" establishes a formal and polite tone, which is vital in maintaining the decorum expected in military environments. Proper greetings not only reflect respect for the rank and position of the officer but also reinforce the ethos of discipline and respect within the military.

In contrast, greetings such as "Good night, sir/mam," while friendly, are not suitable during the daytime as they imply a time when people are retiring for the day. Casual greetings like "Hey there" and "What's up, sir/mam" lack the formality required when addressing an officer and can be perceived as disrespectful or too informal for the military setting. Therefore, "Good morning, sir/mam" is the correct choice for daytime reporting.