Words cannot begin to describe the burden Ray and Martha Goyet will carry every day of their lives. High school sweethearts who grew up in Westbrook and then embarked on a life in the military, they looked on with pride as their son, Mark, enlisted in the Marines right out of his Texas high school in 2008. And then, three years later, they watched in horror as his flag-draped casket came home from Afghanistan. He’d volunteered for the deployment, his second to a war zone.