Exhausted, he must endure. Endure hardshipIn order to protect the land.Protecting people in national securityMilitary occupation hazardousNeed to be aware of every step in the walk.And the risk of death at any time.
He had to endure the toil , endure hardship , to protect the national security, protect the people in the military as a career at risk have to be careful every step of the way and risk death all the time.