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Krall basic service on board Enterprise during the Xindi conflict and MACO did play role save Earth and human race likely play and did play role Earth and Romulus war. Which leads key fact MACO disband not all them offer Starfleet commission only those likely multi skilled. Those not only pass advance hand to hand combat which equal to if not better MACO hand to hand combat but, those who had which Pike request JJ verse star Trek 2009 but, those could also pilot shuttle do have dozen other things on Starship.
Krall friend basic put into lost jobs some not able to get another one. This does go into number one strength MACO had over Starfleet security that want though advance hand to hand combat training would use sniper rifle. Starfleet Caption time of war could take member MACO not offer commission throw him or her into service and throw right back garbage can when they done. Talking Krall reason to be angry.
Kirk statement you won use peace no wonder Krall did not care.
Basic put we only see MACO armed with stun baton. My question is why after all in Star Trek Undiscovery country hand phaser shot close range is lethal. One could argue that it require marshal art training make most of it. Then again we Sula advance hand to hand combat training. Argument Starfleet security stander training not just yellow or red shirt is also important point to make.
Which leads me to ask simple question why?
Simple put what see with UFP security not seem real up to task of carry out command like raid to try undermine enemy equipment in harder targets. Simple place let use Cardassion Base in Once more to Breach were civilian population. Real way want to take those kind defense out would with commandoes raids. You like Orbital sky diving combine with personal train sneak in use charge damage the weapon equipment and leave using three S speed, Surprising and stealth.
Possible answer Simple answer is Science fiction. UFP able to normal officers these kind mission without Collateral damage damage.
Special forces existed either by exchange program like advance Interstellar combat or something like advance tactic training. Now exchange program leading to better hand to hand combat some form UFP security is extremely likely. Claim all culture exchange program.
Another possible advance training course for security personal. We heard advance tactic training .
This what I have come up with I interest your ideas