Mandate the purchase of In-Vessel Composters at all DoD installations that have housing and dining facilities.
This idea falls under cost avoidance. DoD installations pay for waste disposal, and an in-vessel composter would pay for itself in less than 4-7 years (depending on solid waste disposal prices at each location).
The composter would also provide mulch and landscaping materials that would provide further cost avoidance to facilities managers on the installation.
For a frame of reference, the manager of the Recycling and Solid Waste facility at West Point has been trying to get an in-vessel composter for at least the last two decades, and it always gets cut from the budget. He pays about $70/ton to send solid waste to a landfill in another state (because New York is out of landfill space).
The amount of potential savings in cost avoidance is astronomical.
This idea is similar to some of the cost savings initiatives being proposed by Congress with "block buys" in space systems (and the idea that you can save money in the long run if you purchase things up front that pay for themselves over a time period longer than the FYDP).