I think sending out a monthly newsletter would be enough with an option to subscribe. The content ideas that my customers may enjoy are:
1.
Free pizza on Veteran's Day. The reasoning is active duty military love to get free stuff with no strings attached. Once the email gets to one senior enlisted or officer on base the word gets spread like wild fire. Not everyone goes to get free stuff but its nice to know its out there.
2.
Open during federal holidays and extended weekend hours. The reason is there is always someone on base working during the holiday and weekends. Another reason is to have a place to hang out or sober up before heading back on base.
3.
Free Turkey dinner on Thanksgiving and a place to hangout. Not everyone who lives in the barracks goes to the mess hall or someone's house for Thanksgiving. This is another option for them to consider when away from home.
4. Mention a significant event in military history during that month like for example 23 February 1945 the U.S. flag raising at Iwo Jima on Mount Suribachi. Make trivia questions and games related to Marine Corps history. The reasoning is to remind young military members of our past and what they do is part of our military history.
5. I would also use cartoons like from
Sempertoons which are funny because they have a little truth to them. Active duty military members like satirical things about their way of life. It's one of those things that gets forwarded in an email or printed out.