What does the slogan Shotit mean on the helmet of the pilot of the J-15 carrier aircraft?

"shoot it" is a common expression in English, which literally means "fire" and can also be simply extended to "hit him/beat him" commonly used in Chinese.

Beat him: the domineering slogan on the helmet of the pilot of China's Liaoning J-15 fighter

As early as 214, after the official propaganda film of China's Liaoning ship came out, the US Pacific Fleet immediately released a propaganda film on the same day (as a response) with the name "Shoot 'Em If You Got 'Em", which was a blatant challenge to the China navy. Therefore, the China Navy is ridiculed by the Americans again this time, saying, "Come and fight if you dare.".