1. To fight in or be in service to the military alongside someone else. I'm so sorry for your loss. I served with your mother in the marines—she was an exceptional soldier. Sign up today, and serve with some of the finest people the country has to offer.

2. To provide or present a formal notice or announcement to someone, some group, some organization, etc. In this usage, a noun or pronoun is used between "serve" and "with." I can't believe he served us with an eviction notice the week before Christmas. Federal investigators served the multinational tech company with a search warrant in an effort to crack down on tax evasion.

3. To provide some kind of food or beverage alongside something different. Often used in passive constructions. In this usage, a noun or pronoun is used between "serve" and "with." They're serving fish with red wine? How uncouth! The chicken is served with green beans and mashed potatoes.