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ALCOAST 445/20 - COVID-19: GUIDANCE ON THE USE OF CLOTH FACE COVERINGS (FACE MASKS) – UPDATE 2

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R 091320 DEC 20
FM COMDT COGARD WASHINGTON DC//CG-11//
TO ALCOAST
UNCLAS //N05100//
ALCOAST 445/20
COMDTNOTE 5100
SUBJ:  COVID-19: GUIDANCE ON THE USE OF CLOTH FACE COVERINGS (FACE MASKS) – UPDATE 2
A. COMDT COGARD WASHINGTON DC 061552 APR 20/ALCOAST 124/20
B. COMDT COGARD WASHINGTON DC 171929 APR 20/ALCOAST 144/20
1. This message provides additional guidance for the use of cloth face 
coverings (Face Masks) to prevent the transmission of COVID-19 when at least 
6 feet of distancing cannot be maintained as directed in REFs (A) and (B).
2. Terminology: To better align with CDC updated terminology, the term “Cloth 
Face Covering” is replaced with the term “Face Mask.” Future uses of the term 
Face Mask includes items described in REFs (A) and (B).  
3. Biological Source Control Considerations: Units must recognize the 
vulnerabilities of personally supplied face masks that contain exhalation 
valve(s) or consist of a single layer of fabric. Face masks protect others by 
containing aerosol droplets produced when you breathe, talk, etc. Valve 
equipped face masks fail to provide this source control. Exhalation valves 
allow droplets possibly containing the COVID-19 virus to escape into the air 
and may expose others. 
4. Policy: Guidance in REFs (A) and (B) remains in effect. 
   a. Use of face masks with exhalation valves or vents is prohibited. 
   b. Single layer gaiters are prohibited. This policy does not prohibit 
organizational clothing or uniform items that meet CDC multi-layer guidance.  
CDC guidance on gaiter wear: https://www.cdc.gov/coronavirus/2019-
ncov/prevent-getting-sick/about-face-coverings.html. 
5. COMDT (CG-113) POC: Mr. Glenn Gebele (202) 475-5195
6. RADM Dana L. Thomas, Director, Health, Safety, and Work-Life, sends.
7. Internet release is authorized.