Which document provides guidelines on the disposal of ammunition?

The most appropriate document that provides guidelines on the disposal of ammunition is the Ammunition Disposal Manual. This manual is specifically designed to outline the procedures and regulations for safely disposing of ammunition, including various methods and safety measures that must be followed to prevent accidents or environmental harm.

The other options mentioned do not focus on ammunition disposal specifically. The Small Boat Product Line Processing Guide pertains to the management of small boat maintenance and operation, not ammunition handling or disposal. General Maintenance Procedures address the upkeep of various equipment and systems but do not cover the specific processes related to ammunition. Lastly, Ammunition Safety Guidelines primarily focus on the safe handling and storage of ammunition rather than disposal procedures. Therefore, the Ammunition Disposal Manual is the correct resource for disposal guidelines.