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Top Counties for Army Recruitment   
The 500 counties with the highest recruitment rates in a given year as a percentage of population, excluding counties with fewer than five recruits.

Yes, they are almost all rural counties.  (That's Marinette County in Wisconsin.)

The Army, in Need of Recruits, Turns Focus to Liberal-Leaning Cities.  (The New York Times, 1/4/2019)

The Army is not quite counting on miracles, but after falling 6,500 soldiers short of its goal nationwide for the fiscal year that ended Sept. 30, it is trying a new strategy that might seem almost as unlikely. 

Rather than focus on more conservative regions of the country that traditionally fill the ranks, the Army plans a big push in 22 left-leaning cities, like Chicago, San Francisco and Seattle, where relatively few recruits have signed up.