The new Utah State Courts' page on Default Judgments provides information about what is required to ask for a default judgment, including when the person who does not answer is in the military. Servicemembers have special rights that protect them from default judgments while they are on active duty and may not be aware of the pending case.
When you ask for a default judgment, you will be asked to provide proof that the other party is or is not in the military. If you have the person's name and social security number, you can easily verify this information through the Department of Defense Manpower Data Center.
For more information on default judgments, including forms, visit the Courts' page on Default Judgments.