I think they're simply practicing dynamic movement which is... fairly dumb if they're preparing for a siege on Tran Ranch. It "looks good" on video though.
Disclaimer: I've never served in any kind of armed forces. To me it looks like they're always practicing assault drills instead of readyness, firearms handling, reload drills, cover/concealment, or anything that would serve them better in a siege scenario. It's all for the People of Twatter and the asspats they can give.
Dynamic Movement = Moving while shooting/taking cover.
The reason they are doing this is the Army Troon (I can't remember which thing is which). This what the army trains you on, and so that's what the army troon is parroting to the other troons. Lots of assaults, rushes, taking positions. It builds cohesion, increases agression underfire, and taking held positions is something you're going to be expected to do.
When I was in, we did bayonet training. One of the guys in my platoon basically asked a round about way "What's the fucking point? When was the last time anyone got bayonetted?" and our DS, in a rare moment of honestly, told us the point: Its not that you're ever going to be expected to use a bayonet, you'll probably never even be issued a bayonet because the army doesn't want the liability of you doing something dumb with it, and the last time anyone used a bayonet in actual operational capacity was probably using the hinge on the case that turns it into a shitty & awkward wire cutter. The point is that it trains you to be active and agressive instead of passive whimpering soyboys, and you do it with your squad. They send you into the unknown and expect you to stab the the balistic dummies. The course has deliberately short line of sight so when you're waiting all you hear is yelling. When you're in, you lose sight of your buddies at times and you all pop out to stab the dummies.
These troons are trying to Cargo Cult army training so they can play army and feel cool. They have none of the understanding of what they were trying to do, and also don't get that as unit of a larger force, the army can waste time with unnecessary training under the guise of building you into the Army Way (hooah), with the assumption that when its time to do something important you'll either be relieved by a unit competent in whatever needs done, or you'll have a few months to get the specialized training when the time comes. When you are a small force underlock down, underseige by 24 buff and hard
US Marines Earl Militia men, you don't the luxury of fucking around and waiting for someone else to take over. Everything you are doing should be mission focused.
During peace time you'll arrange for your unit to go to the orienteering range, or arrange a bullshit FTX. Once you have orders, everything is going to be based around getting ready to deploy. If you have orders to get ready to deploy to Germany to get ready to fight the russians, you aren't going to waste time on Desert Survival training or learning swahili.
The troons are wasting their time learning assaults and advances. They need to be learning defense, practicing casualty retrieval/evac*, having pop up targets so they can learn to redirect fire quickly to attacker action. And really all that is tertiary to fire-proofing/fire controlling their compound, because as it stands you could decisively end any threat the tranch poses as a fighting force with a flare gun.
* I want you to picture any of those troons trying to shift BonBon or Penny.
At least this will be good fodder for whoever makes the next parody video.
