I have nothing against instructors using the name of a military unit to sell either their own hand-to-hand combat system or one that is used effectively by that unit. Not at all. For the most part, I see this as a marketing thing and each instructor/author has to make decisions on that front.
If you want to connect a USB device to an HDMI device then you must use a converter box. This is a set of electronics that change the protocols and signals. The only adaptor which works is the DVI-HDMI ones.
A USB 3.0 cable or device may be plugged into a USB 2.0 port, but the super speed rate will only work with USB 3.0 cables, devices and ports. USB 3.0 technology will be able to upload and download simultaneously from separate wire lanes of traffic (two wires to transmit, two wires to receive data).