The difficulty in differentiating between individuals and in determining each person's unique skill set before they are on the job is the reason all soldiers go

The difficulty in differentiating between individuals and in determining each person's unique skill set before they are on the job is the reason all soldiers go through the same basic training and then are assigned to their specialties At least in the US, that's definitely not how it works. Enlisted folk take the ASVAB before even joining. Based on those scores, they select what job they want to do before even signing on the dotted line. Recruiters are infamous for lying to enlistees about what jobs are actually like, or about whether enlistees will be able to change rates after/during bootcamp. In my experience (as an officer), most enlistees feel cheated by the system, but must "suck it up" because it's the military and they've signed away their life. Officers join either via ROTC/Service Academy or OCS. With OCS, all officers are assigned their specialties before signing on the dotted lines. (Imagine if a doctor had to join without being guaranteed a spot as a doctor!) In ROTC or a Service Acacademy, officers have 4 years of training before they select which community to join. About 1/2 the officer corps joins this way, so about 5% of the overall military.