When one spouse is in the military, often times that career becomes the central point to the other members of the family. Where the family lives, what kind of work the spouse does, and when family vacations are planned. The military spouse, however, doesn't just sit around. Military families are very busy and military spouses often have many obligations other than their spouse's service. Many military spouses choose to volunteer because it's something fulfilling and meaningful to do that has more of a flexibile schedule - which is key in the service.
Volunteering also allows the spouse to meet a variety of people they wouldn't have met otherwise and form friendships with people from outside the base. Not only that but volunteering lets you use the skills you have and develop new skills that can help you find a job or just grow as a person. In addition, when you're moving around all the time, it can be tough to feel a connection to a new city or country even. Volunteering lets you get a chance to feel involved in a community.
Why else do mil spouses volunteer?