The U.S. Army is seeking sources to develop a standardized in vitro digestion method for Meal, Ready-to-Eat rations, followed by batch fermentation and microbial community characterization. The objective is to simulate human gastric digestion and assess how different ration types affect gut microbiota. Interested parties must submit a BAA preproposal by 4 June 2026, 5 PM EDT, to the specified email contacts. No budget information is provided, and the location for performance of services is not specified. This is a sources sought announcement only, not a solicitation, and no funding is currently available.