Complex sentence: A wide range of Field Manuals including 31-15 can be accessed through web sites that catalog the obsolete US Field Manuals, however, supplement B is not among the field manuals publicly released by the military.
Split into simpler sentences: A wide range of Field Manuals including 31-15 can be accessed through web sites that catalog the obsolete US Field Manuals. The supposed supplement B is not among the field manuals published by the military.