The U.S. Army Combat Capabilities Development Command (DEVCOM) has released a Request for Information (RFI) regarding Tactical Data in Use Security, aiming to gather insights from businesses on integrating Zero Trust (ZT) security capabilities into existing tactical network architectures. The initiative emphasizes the need for enhanced data protection against emerging cyber threats in challenging operational environments characterized by denied, degraded, intermittent, or limited communications. Traditional security models are no longer sufficient, prompting a shift towards ZT principles that ensure continuous risk assessment and verification of access to network resources. The Army seeks responses detailing capabilities in protecting critical data, demonstrating relevant technology, and providing information on Technology Readiness Levels and associated risks. Interested parties are instructed to submit their responses within 30 days, emphasizing that this RFI does not constitute a solicitation and that costs incurred will not be reimbursed. This RFI serves as a precursor for developing future acquisition strategies and technical specifications, aiming to strengthen tactical data security.