To a great degree, every US private was expected to be able to take over for a corporal, every corporal for a sergeant, every sergeant for a LT, every LT for a Captain, and so on without a dropoff in effectiveness. One US general said that you didn't have to tell the US soldier what to do. You told him what needed to be done then got the hell out of his way. US units were expected to be self-sufficient, able to adapt on the fly, think for themselves, and so on. The Germans were so top down that they had a bad reputation for just stopping and having no idea what to do or being scared to do anything without direct orders when they lost a commanding officer.