Hospital corpsmen were previously trained at Naval Hospital Corps School, Great Lakes, Illinois until the 2011 Base Realignment and Closure Bill caused Hospital Corps School to be relocated to the Medical Education and Training Campus (METC) at Joint Base San Antonio, Texas.
characteristic of highness or lowness of a sound is called The frequency of a sound wave determines the pitch of the sound you hear. Remember that frequency is the number of waves passing a fixed point in a given period of time. A high-frequency wave with short wave-lengths, such as that produced by a tiny flute, makes a high-pitched sound.
As explained by the Art of Manliness, you can identify your voice's mask by closing your lips and generating a casual mmhmm sound. As you do this, you'll feel a slight vibration in the area of your face between your upper lip and nose. This will help you find your natural pitch and tone, what's known as the mask area. It's also much better than trying to force a deeper tone by speaking from the throat: When you speak from your lower throat to get that low pitch, you produce a sound that lacks carrying power. Try speaking with an artificially lowered pitch again. Go as low as you can, but speak as loud as you can.