Rifle Drill
I'm just going to throw something out there, as a guy sitting around on a Sunday morning with a cup of coffee and a lot of studying ahead of me:
Marine recruits spend a ton of time drilling with rifles. Of course, drill is mainly to instill discipline, teamwork, confidence, esprit de corps, attention to detail, yadda, yadda, yadda.
Another major reason that recruits learn rifle drill (specifically) is because they use those very same rifle drill commands in the fleet during formations and parades (changes of command, posts and relief, memorials, etc.) In addition to the benefits of drill at boot camp, the recruits are taught the basic drill maneuvers that they will see again and again throughout their careers (as well as getting used to carrying a rifle everywhere).
Marine officer candidates (and, to a much lesser extent, TBS studs) spend a minimal amount of time drilling with rifles (as compared to recruits, of course). Candidates are primarily taught these skills in order to give a baseline by which to conduct a candidate-led drill evaluation - in other words, to test the candidates' abilities to lead a formation. (Anyone who has seen a candidate "Final Drill" competition as compared to a recruit "Final Drill" competition - heck, a recruit "INITIAL Drill" knows that recruits can/do out drill officer candidates any day of the week and twice on Sunday...then again, look at the different missions of MCRD and OCS.) Officer candidates do not need to get into the gnats-arse detail that recruits do for drill. Why? Aside from OCS graduation, officers don't usually drill with rifles. They carry swords or pistols.
Sooooo......why do I post this on a Navy thread?
Perhaps one of the reasons rifle drill went away in P'cola is because the time spent learning how to carry a rifle you'll probably never see again can be better spent on other aspects of training. You can still gain all of the benefits of drill even if you don't march around with a "drill stick" (rifle). If you're not carrying a rifle, the DIs can (and will) nitpick every other little thing about you - your sword, your posture, appearance, stride, arm swing, vocal abilities, etc, etc, etc. In the meantime, training hours are freed up to be spent elsewise.
Enough from this old Jarhead.
Back to my coffee.