The squad were having “visual training”.One smart recruit was asked by the officer to count how many men composed a digging party in a distant field. The party was so far away that the men appeared as mere dots，but unhesitatingly the recruit replied：
“Sexteen men and a sergeant，sir.”
“Right，but how do you know there's a sergeant there？”
“He's not doing any digging，sir.”
视力训练
班里正在进行“视力训练”。 一个聪明伶俐的新兵被班长叫出来数远处旷野上采掘队的人数。采掘队在很远的地方，那些人看起来只是一些小点儿。但是这个新兵毫不犹豫的回答：
“十六个士兵和一个中士，长官。”
“正确。可你如何知道那儿有一个中士？”
“他不干活，长官。”