system
Given the following post, respond as if you're commenting on Reddit:
human
[General Zombie Media] What are some legit tactics that Marines and soldiers can utilize against zombies?

(For reference, we’ll do both slow, walking Walking Dead-type zombies as well as the freakishly and inhumanly fast zombies from Train to Busan/Peninsula/Kingdom. Also, we’re not going to use the zombies from the World War Z novel. As much as I love that book (definitely check it out if you haven’t already. Absolutely recommend it), the zombies there were imo written so that they’d be immune to our military and break all of our laws of physics, biology, etc. so for that reason, we won’t use them). 

Assuming that no other powerful military hardware like our artillery pieces, armored vehicles/MBTs, aircraft, missiles, etc. were utilized (because otherwise this would be WAAAAAY too easy for the military since Zeke can’t bite you if it turned into pink mist) were used and only guys (and girls) armed with either traditional M16A4s or M4A1s were what was given to you, how would you develop a doctrine to combat the undead? 

 Personally for me, I think that making suppressors standard-issue would be a no brainer. I’d also make everyone be as fast as possible so probably no or only a little body armor and we’d go back to LBEs/Load Bearing Equipment. Marines and soldiers would be utilized like modern dragoons where they dismount from a vehicle, pick a couple zombies off or harass the herd, then after a designated amount of time (say, 10 minutes), everyone hauls ass out of there and head off to the next spot. ACOGs would also be issued out as the standard optics for their rifles and everyone will also have both an OKC-3S bayonet as well as an E-Tool for melee combat.
gpt
I mean realistically what we do now works fine. Modern soldiers are very precise and shouldn't have any issues with head shots especially if the zombies are slow.

Assuming it even reaches that point. Zombies have no air defense, don't know how to scatter when artillery is inbound, and frankly have zero countermeasures against literally just being run over by tanks. Or even just some guy driving his car. Zombies are terribly combat ineffective against everything unless they outnumber the enemy hundreds to one. They also don't have the intelligence to make group movements in search of prey, instead preferring to aimlessly wander in the same general place. This results in swarms that can be engaged and disengaged whenever the military wants.

Additionally Zombies are awful at multiplying. Their only method of reproduction requires they face off against their biggest predator - us. How many zombies can a squad of soldiers kill? How about a few police? That neighbor with a shotgun? What about you just driving a car? Anything more dangerous than a child holding a rake should be able to manage a positive kill to death ratio and that's before we start looking at the ridiculous number of bodies an Abrams tank should be able to wipe away.

Zombie media loves to show the aftermath but never really likes to show the early days. The rare times the military is shown they are facing thousand to one odds surrounded on all sides but the reality is even if some areas were overrun they would be quarantined and dealt with quickly. In the real world Zombies would get decimated by modern military forces so hard that we'd actually feel bad for them.