If you want someone to calm down, you might say “Cool your jets!” This expression is among several catchphrases from a 1950s TV show about the extraterrestrial adventures of Tom Corbett, Space Cadet. Others include plug your jets, meaning to shut...
diamond n.— «First sergeants are required to be at least a master sergeant to wear a diamond on their sleeve, which is why they are sometimes referred to as “diamonds.” However, technical sergeants may be selected to hold the additional-duty first...