“The government better not deploy you this week,” I warned my husband, only half-joking. Robert missed last spring’s two performances of Carl Jenkins’ “The Armed Man” by days. In reality, he has no choice when he is sent to various sites across the country, but I was devoutly hoping he’d not be deployed until, say, Friday. Would the government understand? Had they heard this piece last spring, perhaps they would. The Sierra Master Chorale and Orchestra partnered Thursday to perform this viscerally moving concert about war and peace for a third time. And all points of view will be in …