D.C. Code § 49-403: Assessors to make list of persons liable to enrollment.

The Mayor of the District of Columbia shall provide for the enrollment of the militia, and for this purpose may require the assessors of taxes, at the same time they are engaged in taking the assessment of valuation of real and personal property, to make a list of persons liable to enrollment, and such record shall be deemed a sufficient notification to all persons whose names are thus recorded that they have been enrolled in the militia. Immediately after the completion of each enrollment they shall furnish the Commanding General of the militia with a copy of the same.