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Excluding Federal Holidays, the Customer Service Center (CSC) is open Monday - Friday from 8 AM to 4:30 PM EST and closed every Thursday from 1 PM to 2 PM.
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For the quickest service, use one contact method, either phone, email, or live chat during operational hours.
Need to apply or submit additional documents? For FASTER service, send to:
Merchant Mariner Credential:
Reminder on Thursdays from 1 pm to 2 pm EST CSC agents are in Training.
Please note the following exceptions to normal business hours (Monday–Friday, 8:00 AM–4:30 PM) for the National Maritime Center (NMC) Customer Service Center (CSC):
*This holiday is designated as "Washington’s Birthday" in section 6103(a) of title 5 of the United States Code, which is the law that specifies holidays for Federal employees. Though other institutions such as state and local governments and private businesses may use other names, it is our policy to always refer to holidays by the names designated in the law. **July 4, 2020 (the legal public holiday for Independence Day), falls on a Sunday. For most Federal employees, Monday, July 5, will be treated as a holiday for pay and leave purposes. (See 5 U.S.C. 6103(b).)