A staff sergeant in the army for 6 years would earn approximately $35,577.80 annually. To join, one must be at least 17 years old and complete boot camp, which involves running 1.5 miles in under 15 minutes and multiple exercises. Life in the army offers the possibility of traveling the world in various climates, free health insurance, respect from others, and allows some fun for patriots who want to serve their country in this important job.