See more Moteefe: https://moteefe.com/store/firefighter-heroes-live-among-us-t-shirt
Firefighter Heroes Live among US T-Tank top and ladies tee
Most fire departments run 24-hour shifts and then take a 48-hour break. For my department, there’s a Red, Black and Gold shift. One day is R, B, G and they work for 24 hours on that shift and then turn off 48 in the other two shifts if that makes sense. This is a case of the Doppler effect with the stationary source. (The stationary here is meant for ambient air.) In each case, the listener is moving, in turn toward and away from the source.