Why did the Spartans place so much stress an military service?

The Spartans placed immense emphasis on military service due to their need for a strong defense against external threats and the control of their large helot population. Their society was heavily militarized, with a focus on discipline, endurance, and communal strength, which they believed were essential for survival and dominance. This military ethos was ingrained from childhood, fostering a culture that prioritized martial prowess and loyalty to Sparta above all else. Ultimately, their survival hinged on the effectiveness of their warrior class in maintaining both internal order and external security.