Frequencies for first 10,000 rows of veteran variable in morg91 dataset :

                          Veteran |      Freq.     Percent        Cum.
----------------------------------+-----------------------------------
          Vietnam Era (8/64-4/75) |        402        4.02        4.02
           Korean War (6/50-1/55) |        185        1.85        5.87
         World War II (9/40-7/47) |        426        4.26       10.13
         World War I (4/17-11/18) |          5        0.05       10.18
Other Service (all Other Periods) |        356        3.56       13.74
                       Nonveteran |      8,591       85.91       99.65
                                . |         35        0.35      100.00
----------------------------------+-----------------------------------
                            Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 15 Mar 2017