Which document provides specific single-point safety requirements for ammunition?

The correct answer is that DOD 4145.19 is the document that provides specific single-point safety requirements for ammunition. This directive is part of the Department of Defense's guidance and focuses on safety measures that are crucial when handling and storing ammunition. It establishes protocols to minimize risks and ensure a high safety standard across various operations involving ammunition.

The other options do not specifically address single-point safety requirements for ammunition. DA PAM 700-16 is more focused on the management of ammunition supply, including the use and tracking of ammunition. FM 9-13 is generally associated with the broader aspects of ammunition logistics and management, addressing various procedures and responsibilities but not specifically the single-point safety aspect. ATP 4-33 deals with the logistics of sustaining weapons and ammunition in a field environment, which again does not hone in on specific safety requirements in the manner that DOD 4145.19 does. Understanding this context helps clarify why DOD 4145.19 is the key document for single-point safety in ammunition handling and operations.