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.
Audio can be embedded from HDMI, balanced analog or AES/EBU inputs. Mini Converter HDMI to SDI is ideal for adding an SD or HD-SDI output to computers and cameras that have HDMI connections, and for when you donât need the cost of the Ultra HD model!