Good news, bad news joke

In the later period of the Japanese invasion of China, after being chased by our army for many days, people were already worried. If the uniform is not changed for days, every soldier's thigh root will rot. At this time, the first mate brought good news and bad news. The good news is that after research, I decided to change a pair of underwear for each soldier. The bad news is: the first mate ordered: little master! You and Kameda change; Yamamoto! You trade with Koizumi! .....