Frequencies for first 10,000 rows of d_armed variable in mcbsatc2013 dataset :

Ever served |
   in armed |
     forces |      Freq.     Percent        Cum.
------------+-----------------------------------
         -8 |          3        0.03        0.03
         -7 |          1        0.01        0.04
          1 |      2,168       21.68       21.72
          2 |      7,826       78.26       99.98
          . |          2        0.02      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 24 May 2016