Which material specification is NOT related to military applications in aviation?

The correct choice related to the question is one that highlights a material specification not specific to military applications in aviation. ISO 9001 is an international standard that focuses on quality management systems rather than material specifications specifically for military use. It sets criteria for organizations to ensure that they consistently provide products and services that meet customer and regulatory requirements, but it does not pertain directly to the materials used in military aviation.

In contrast, the other choices represent specifications closely tied to military aviation. AMS 4081 relates to aeronautical materials used in aerospace contexts, while MIL T 6845 is specifically a military specification that covers particular technical requirements for materials and their applications. Federal QQ A 250/5 also deals with specifications relevant to military applications concerning aluminum alloys used in aircraft and military equipment. Each of these options serves to guide the selection and use of materials in military applications, making them relevant to the context of the question.