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Respiratory Protection Program for Firefighters Also offering Medical Director Services. For more information, please call or email: Charles E. Truthan, DO, FACOFP About Charles E. Truthan, DO, FACOFP Home | Mission | Manual | Services | Order About | Alerts | Articles | Email F.D. Doc® is the trademark of F.D. Doc Services, Inc. and F.D. Doc, P.C. |