Military electronics can include which of the following?

Military electronics encompass a wide range of specialized technologies designed for various defense applications. Underwater sound equipment is an important part of military electronics, as it plays a critical role in submarine warfare, underwater surveillance, and communication systems. This type of equipment is used to detect and classify underwater objects, such as submarines or mines, and is integral to naval operations.

In contrast, while consumer electronics like basic gadgets can have some utility in military settings, they are not specifically designed for military applications and therefore do not fall under the category of military electronics. Common communication devices, though essential for military operations, are generally expected within a broader range of technologies rather than being classified under military electronics alone. Wireless networking equipment, while also relevant, serves more generalized purposes in communication rather than specific military functionalities.

Thus, underwater sound equipment stands out as a specialized technology explicitly utilized in military contexts, making it the correct answer to the question about military electronics.