H.R. 6138 directs the Secretary of Defense to create a pilot program that partners military installations with nonprofit organizations called "basic needs banks" to provide free diapers and diapering supplies to military families facing financial hardship. The bill specifically defines eligible partner organizations as nonprofit entities that are members of the National Diaper Bank Network, have been distributing diapers for at least five years, and provide basic necessities at no cost to families. The legislation also requires the Secretary of Defense to work with the National Diaper Bank Network to provide technical assistance to these partner organizations and evaluate how well the pilot program works. This bill targets active-duty military families and addresses child care affordability, a recognized challenge for military households. No specific funding amount or timeline for implementation is mentioned in the legislation itself.