This is specifically with regard to plate carrier modular armor.
Presently, there are a few categories of suits of modular armor that exist within the game, each with their specific roles and statistics. These are:
The security officer's vest/generic armor vest set, also found in the crew armory. This is equivalent to a measly tier 3 to tier 4 all-around weapon protection, but is certainly better than nothing. This might block something that does less than 20 damage, but not much more than that.
The heavy corporate suit, or the tan heavy armor set. This is equivalent to tier 5-6 protection, and will block small damage attempts, or soften small caliber bullets without issue, but generally cannot compete to rifle caliber weaponry or better. The slowdown is considerable when wearing this armor. This is effectively the "medium armor" tier of available armor.
The next category is odd, as they all include the riot suit, the ballistic suit, and the ablative suit. These are all one-trick pony suits that almost completely block incoming damage -- of a specific damage type that they correspond to, roughly tier 7. Riot for melee, ballistic for bullets, ablative for energy and laser projectiles. For damage that they are not specialized for, they do "fuck all" in terms of protection, with a measly tier 1 protection modifier. Interestingly, they have the exact same slowdown as the medium armor already mentioned. This category isn't even necessarily heavy armor -- it's situational heavy armor. If you have ablative armor, you can't peek the hallway that has a 7.62 rifle pointing down it, or you will get clipped and are expected to be mandatorily sent to medbay.
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To me, this division of armor to be specialized rather than generalized is deeply unsatisfying, and does not really make much sense to even mass-produce to be available. Antagonists have no equivalent access that which security possesses to specialized heavy armor. And frankly, the ballistic suits tend to be far more useful anyway, as taking bullets are the most dangerous, due to how easy guns are to shoot, but lasers don't inflict the great risk of internal bleeding, bone breaks or organ damage on the first blow. And even if antags did have their own version of ballistic armor, well, laser rifles exist, regardless of the side, leading to a stupid "rock paper scissors" game loop rather than simply abiding to what is simpler and more satisfying game logic: if you get shot too much, you should probably die. We can extrapolate reasonable responses to this: Either do not be in a position to get shot up too much, or bring heavier armor to soften the blows you take in order to get what you want accomplished. Or have something in-between, why not? Medium armor would still be usable for whoever is left over in the department, or for merc teams.
We can do some neat meaningful tradeoffs for armoring up versus armoring down, too. I'll provide a proposal for what I think would actually be better.
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Stab vest: becomes part of the roundstart basic officer, warden, cadet, and investigator kit, replacing the "light" set of armor for the security department. While they possess identical armor values to the light kevlar set, armguards and leg-guards cannot be attached, and no helmet is included. This is just a basic code green kit - and since the old light vest was not mandatory to wear before, this does not have to be either. No slowdown, 3 slots for tools or other small items.
Light kevlar plate carrier (formerly the security officer's plate carrier, identical to generic plate carrier also found in the crew armory): Moved to the basic brig armory with 4 carriers, helmets and arm/legguards, resistances stay as generalized as they already are. Has expanded-capacity drop pouches exclusive to light plates, allowing 5 slots for tools. The light kevlar helmet has an integrated GPS and helmet camera to be enabled at will, in addition to an integrated flashlight. It has two slots, perhaps for weapon magazines, or for your debilitating smoking habit. The crew armory generic armor set also share these upgrades, to permit the militia decent utility in a red alert crisis. 0.3 slowdown. The head of security's locker starts with a variant of the light kevlar armor plating, with an easy to pick out helmet and same old special stripes. The warden does as well, albeit as fancy as a standard light kevlar plate carrier.
Medium ceramic plate carrier (formerly the heavy [corporate] plate carrier set): 3 vests included in the brig armory. Resistances decreased effectively to tier 4-5. Drop pouches contain 3 slots for anything small, and are exclusive to medium plates. The medium ceramic helmet has one slot for a weapon magazine -- or maybe for a pack of Space Newports? -- and an integrated flashlight/GPS. Slowdown decreased to 0.6 from the old heavy corporate armor.
Heavy riot plate carrier: The actual heavy armor suit. Only one is included, ideally for the person expected to take the majority of the punishment for the security team. Effectively tier 6-7 general protection, with an encumbering 1.25 slowdown. Drop pouches may only contain 2 small items, and the heavy riot helmet offers no space for a magazine, given the real estate of the helmet is entirely dedicated to reinforcement and a punishment-immune reinforced glass flip-visor. The helmet still contains a GPS and an integrated flashlight.
Riot shields are included with the medium and heavy armor sets, for a total of 4 riot shields. Notice there's still space free in the armory for another suit set? No need for it. Maybe replace the empty space with a sleepy armory owl on a perch that noisily hoots at people that walk in, or something?
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Okay, so, why all this for security? Put simply: people get to have roles now! The head of security, investigators, warden, and cadet generally aren't encouraged to go see combat, and instead provide, during a code red situation, uses for resolving the crisis that don't involve headbutting directly into the threat. They need to stay light on their feet, and most especially should be trying to transmit important information to their major frontliners. Their helmet utilities also provide the most immediate uses for anyone sitting on cameras, they can keep track of who's scouting around and also provide for second-hand accountability if someone does something they shouldn't and there are two witnesses for it.
As for the officers, you have effectively three linebackers and one quarterback (pardon the sportsball references). The officers in medium armor have reasonable enough protection to hold any flanks, or the backline, or otherwise go at the adversary from the side like a hammer, while the person in heavy armor is the slowly moving anvil. If the officers don't work as a team, their quarterback will get quickly isolated and iced by a mercenary team that means business. Of course, most of this is best case scenario. Sometimes the HOS (due to a small manifest) is the only person who can take the pressure of frontrunning a serious threat and take most of the pressure. And so on and so forth.
Speaking of mercenaries, they should also be limited and beheld to similar lines of logic, with some smaller wrinkles. They get two heavy suits in their armory, two medium suits, and two light suits - as merc teams can only go up to 6. Merc teams have to figure out how to distribute that armor just as much as security does, but they get to have two slow armor tanks instead of the one security has to manage.
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I think the proposal, if implemented, will make shooting each other a bit less stale than it has been currently, as well as make gunfights much more predictable and meaningfully engaging to plan for. In an ideal situation, you could just walk away from the guy in the heavy armor and avoid a confrontation, but you have to deal with the quicker ones, or they'll never give you a break.