SP-728 (NATO STANAG NCAGS)

A NATO doctrinal publication for Naval Cooperation and Guidance for Shipping (NCAGS). The seed cites the designation SP-728, but the published NCAGS doctrine in the NATO catalog is ATP-2 (Allied Tactical Publication 2), adopted under STANAG 1430; the SP-728 number cannot be confirmed against the NATO standardization listing as the NCAGS publication. The substance is the same NCAGS framework: voluntary cooperation between naval commanders and merchant shipping during operations and tensions short of war. Treat the specific SP-728 identifier as unverified.