At the link, quoting from the letter:  With great disappointment, we have concluded that the Department of
Defense (DoD) stands in clear violation of a central provision of this
federal law, which mandated the creation of on-base voter assistance
offices. The price of DoD’s failure to follow the law will likely be
paid this November by military service members and their families, whose
voting rights were to have been safeguarded by this provision.

At the link, quoting from the letter:  With great disappointment, we have concluded that the Department of
Defense (DoD) stands in clear violation of a central provision of this
federal law, which mandated the creation of on-base voter assistance
offices. The price of DoD’s failure to follow the law will likely be
paid this November by military service members and their families, whose
voting rights were to have been safeguarded by this provision.