How about raise the pay level? There are other ways to raise an army without resorting to chattel slavery.
Dude--have you seen base pay levels lately? I came in as an E-3 when the base pay was $695/mo. By the time I hit my first boat (E-4 over 2), my base was $877/mo, plus $230/mo for sea/sub/nuke pay. $1100 a month for 300 days a year at sea--18-20 hour days, whether in port or at sea. By the time I got out (E-6 over 12) it was $2010 base, I wasn't making sea/sub/nuke pay, but maybe $1000/mo for BAQ/VHA/Comrats.
Fast forward to today. Were I still in, assuming I made E-7 or E-8 (but let's just stick with E-7), my base would be $4283, sea/sub/nuke pay would be at least $1400, and we're not including BAQ/VHA or any reenlistment bonus (not that there would be SRB at this point.)
So we're talking nearly 6K a month PLUS housing allowance, medical, dental, commissary privileges, etc., etc. Fed, state, and SSI taxes are only taken out on pay, not allowances, and SSI is only taken from base pay.
Don't get me wrong--I know when I was on AD I earned EVERY DAMNED DIME I made. But to say those who serve are chattel slaves is quite inaccurate, to put it kindly. If we don't like it, we're free to leave when our enlistments are up--nobody owns us, skippy.