Recruiting with Social Media

SSG Burrus,
I am the social media manager for my company. I have developed a social media marketing plan that has been enacted at all stations in my company. The key is TTPs in how you are accessing that market without violating terms of service. 
It will take a while to develop a loyal following, but consistency and engagement is key. Ensure Future Soldiers are tagged, new content is posted daily, and discussions are taking place as often as possible. Penetrate the HS market from within using COIs and Future Soldiers sending messages to their friends so that you are not "spamming" people you don't know on Facebook.
We track a number of page metrics and ROI for each RSID weekly. (I am giving Social Media training at my battalion's ATC based on our social media program). 

I am not a FB expert but brain storming; maybe you could do an online article on your website on soldiers who enlisted about a year ago.  They say what they like about the army, you put in contact info and they and their families post it on their wall.  If people keep commenting only it will move up.

I wouldn't suggest post like crazy to be honest. You will bombard your audience losing interest to follow and relevancy. Post once a day or a couple times a week. Make posts relevant to and about your Future Soldiers, their families and your center's Soldiers and families. Alternate between engaging comments or questions that will draw responses and shared photos, articles and posts.

Via the center's fan page you can like local highschools, colleges, chambers of commerce and such. Besides posting on your own page, I'd make more of an effort to post on other peoples' or groups' pages to expose your page more to different audiences.

Lastly, I always convinced my Future Soldiers and their families to like the page during FS Orientation. There are other things you can do with a FB page like share documents or create a FAQ section. Play around with it but expect an ebb and tide of interest. Best of luck SSG Burus!