Yes, the ICC protects service men and women abroad, because it makes sure that there is a forum to hold those who violate international law accountable. Those who commit acts of war and atrocities will be held accountable. It is helpful to service members to know that there is a forum where dictators and other war criminals will be held accountable for their actions.
I hate to say it but the answer is no. Service men and women abroad are basically hostages. People act like they like Americans, but other countries that are not doing as good as we are, they tend to torture us or throw the book at us in court, or just kill us.