Why is there a pentagonal heart in front of the PLA hat?

The five-pointed star is a symbol of peace and justice and an outstanding representative of the Chinese nation.

China People's Liberation Army wears a red five-star red collar badge. This style of military uniform is called Type 65 military uniform.

1965 abolished the rank system, so all officers and men wore red five-star red collars. But there is no difference in grades, and daily training and war are very inconvenient. Therefore, after the Cultural Revolution, 1988 resumed the rank system. Later, the red five-star and red collar were abolished.