Companies producing parts for the defense industry typically require CNC machines that can handle high precision and precision cutting. Some types of CNC machines that may be well-suited for this application include:

1. CNC Lathes: These machines are designed for turning and drilling, and are commonly used in the defense industry to produce parts such as shafts, gears, and other complex, cylindrical components.
2. CNC Milling Machines: These machines are used to cut and shape metal and other materials, and are commonly used in the defense industry to produce parts such as brackets, gears, and other complex, three-dimensional components.
3. CNC Grinding Machines: These machines are used to grind and polish metal and other materials, and are commonly used in the defense industry to produce parts such as ball bearings, gears, and other high-precision components.
4. CNC Wire EDM Machines: These machines are used to cut metal and other materials using a thin wire that is guided by a computer-controlled system. They are commonly used in the defense industry to produce parts such as gears, medical instruments and aerospace components.

It is important to note that specific CNC machines for the defense industry may vary depending on the specific application and the type of parts that need to be produced. It is best to consult with a CNC machine tool supplier or a CNC machine tool builder to determine the best CNC machine for your particular application.