Yellow Book is a free Android app developed by Serco Inc. that provides a consolidated reference to basic data and regulatory criteria for users in the field. The app is designed to be user-friendly and includes hazard classification, physical security, marking, transportation, and storage data and criteria for selected conventional ammunition and explosive items, guided missiles and rockets, current at the time of publishing.

The data and criteria contained in the Yellow Book app are primarily derived from the Joint Hazard Classification (JHCS) database, Federal Logistics Information System data on Compact Disc (FED LOG), Title 49, Code of Federal Regulations (49 CFR), and the 2008 Emergency Response Guidebook (ERG2008). It is important to note that this app is not intended to supersede, contravene, or modify any of these publications or any other DoD or service criteria.

Overall, the Yellow Book app is a valuable resource for anyone who needs quick and easy access to basic data and regulatory criteria in the field. It is a highly recommended tool for military personnel, first responders, and anyone else who works with conventional ammunition and explosive items, guided missiles and rockets, and needs to stay up-to-date with the latest regulations and safety guidelines.