Leading the National Effort. The Department of Homeland Security provides strategic guidance to public and private partners, promotes a national unity of effort, and coordinates the overall Federal effort to promote the security and resilience of the nation's critical infrastructure. November is Critical Infrastructure Security and Resilience Month.
A hamstring injury is a strain or tear to the tendons or large muscles at the back of the thigh. It's a common injury in athletes and can occur in different severities. The three grades of hamstring injury are: 1  grade 1 â a mild muscle pull or strain.ecovering from a hamstring injury may take days, weeks or months, depending on how severe the strain or tear is. A completely torn hamstring (grade 3) may take several months to heal and you'll be unable to resume training or play sport during this time.
1 Rest â keep your leg as still as you possibly can and avoid physical activity. 2  Your GP may recommend using crutches in more severe cases. 3  Ice â apply cold packs (a bag of frozen peas wrapped in a tea towel will also work) to your hamstring for 15 to 20 minutes every two to three hours during the day.