If you get called up at some future date here is one way you can get out of it .
That is of course only if your goverment oby's the 13th amendment's prohibition on involuntary servitude.
Section 1. Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction.
The U.S. Constitution 13th. Amendment
That is of course only if your goverment oby's the 13th amendment's prohibition on involuntary servitude.