MIL-DTL-5015 of multi-contact circular connectors that were used by virtually every aircraft builder in the United States. Cannon's Type "AN" (Army-Navy) series set the standard for modern circular connectors procured under MIL-C-5015—now MIL-DTL-5015—military specifications. The military specification MIL-DTL-5015 was superseded by SAE-AS50151 in December 2009 pursuant to the general United States Department of Defense goal to reduce the number of military standards in favor of industry technical standards supported by Standards Developing Organizations (SDO) such as the ISO 9000 series for quality assurance and the SAE for technical specifications. MIL-DTL-5015 circular connectors are used primarily for their ease of engagement and
International Standard Serial Number International Standard Serial Number An International Standard Serial Number (ISSN) is an eight-digit serial number used to uniquely identify a serial publication. The ISSN is especially helpful in distinguishing between serials with the same title. ISSN are used in ordering, cataloging, interlibrary loans, and other practices in connection with serial literature. The ISSN system was first drafted as an International Organization for Standardization (ISO) international standard in 1971 and published as ISO 3297 in 1975. ISO subcommittee TC 46/SC 9 is responsible for maintaining the standard. When a serial with the same content is published in more than one media