What are some of the marine corps customs and courtesies and how can they be applied to your everyday lives?

One marine custom is saluting. It is a sign of respect and they could apply it to their daily life by respecting somebody of a higher power.

Some of the most important customs of all are those of military courtesy, usually by way of salutes. In the Marine Corps, courtesy is an expression of respect for the authority possessed by an individual, as well as a demonstration of respect for the Corps as a whole.