The Guard and Reserves are made up of all walks of life. MPs and cops have always gone hand in hand. Units have support staff, and others that make it able to deploy as a whole. It isn't unusual to see all that.
The Reserves program offers fish hooks of college money and health insurance (rightfully so) that were very desirable, especially in the last two decades. Keeping the Guard and Reserves isn't cheap, but it reduces the footprint of the military (optics) and are extremely important to the country, even with all the bullshitters there just for free stuff that whine when they actually have to fulfill their contracts. The majority of them are great people that give up time with their families and end up working 12 days straight every month when you consider Drill Weekends, and their two weeks a year.