Munson Army Health Center will be closed, Monday, Sept. 7, in observance of the Labor Day federal holiday. After hours and on federal holidays, beneficiaries may call the MHS Nurse Advice Line at 1-800-TRICARE (874-2273). Nursing staff who support the NAL phone lines can assist beneficiaries with non-life-threatening medical concerns and provide further guidance. Beneficiaries experiencing a medical emergency, such a severe shortness of breath or difficulty breathing, should call 911.