Chances are you are thinking of the insigna for the Forward Observer. An iron fist holding two crossed lightning bolts with the word FIST over it.
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The insignia of a fist holding two lightning bolts is commonly associated with the SS (Schutzstaffel), a paramilitary organization under Adolf Hitler and the Nazi Party in Germany during World War II. This symbol represents strength and power, often used to instill fear and intimidation.
That was my fathers WWII insignia for RAAF signal corps - He was actually a Morse operator in Z Force
The Way of the Exploding Fist happened in 1985.
The muscles responsible for closing the fist are the flexor muscles located in the forearm. They include the flexor digitorum superficialis, flexor digitorum profundus, and flexor pollicis longus muscles. When these muscles contract, they pull on the tendons attached to the fingers and thumb, allowing the hand to make a fist.
The average size of a newborn's stomach is about the size of a cherry or a marble, holding around 1-2 teaspoons of milk. This small size is why they need to eat frequently in the early days of life.
Because they are just about the same size - and you can see your own fist.
Neil Armstrong.