Shaw Air Force Base using sirens, alarms during trainings Military officials say there is nothing to worry about. (Source: WIS) By WIS News 10 Staff | February 10, 2021 at 1:47 PM EST - Updated February 10 at 1:49 PM SUMTER, S.C. (WIS) - Sirens and alarms going off at Shaw Air Force Base have some in the community concerned, but officials say there is nothing to worry about. Capt. Kara Crennan told WIS: “Shaw Air Force Base is currently exercising our mission readiness. Community members can expect to hear alarms and sirens today and tomorrow. We thank you for your patience.” Officials added that sirens and alarms may be heard until 11 p.m.