If you haven't been around for every single Snowbreak event that's run in the past, you're likely missing out on some of the limited items from those events. Some you unfortunately can't get anymore, but the gameplay-related goodies are fortunately permanently available through two sets of Operations missions. This will allow you to obtain event-limited logistics sets and weapons at any time.

How It Works

In the Operations menu, two missions can be found: Mind Refinement and Arms Hub. These correspond to the mission for farming limited logistics and limited weapons, respectively.

Logistics Sets

In Mind Refinement, you can farm for Elite Personnel Limit, a currency that can be spent in the Elite Logistics Officer shop tab:

As well, each run of a Mind Refinement mission will reward progress towards getting a bonus logistics piece from the logistics squad of your choice, selectable via the button at the bottom right.

It takes five runs to get a bonus piece this way. Just like with any other normal method of obtaining logistics pieces, the stats of any pieces you get through either the shop or progression bonus will have random stats.

Weapons

The Arms Hub works similarly to Mind Refinement, with each run rewarding currency that can be spent in the Fortune Weapons Exchange tab of the shop.

Are They Worth It?

Not really.

Okay, let me explain.

From a pure cost standpoint, neither the logistics nor weapon farm are amazing deals. Farming for weapons in this way is far less stamina-efficient than farming them through event shops when the operative associated with them is on rerun. And while the limited logistics farm is actually as AP-efficient as farming logistics pieces through event shops on technicality, it requires a larger stamina investment before you get any logistics pieces, and provides less control on which piece you get, as the bonus logistics piece (which is the only reason why it's competitive in terms of stamina efficiency) is randomly selected from the selected logistics squad, and thus might not be the one you wanted.

But then again, these farms are always available, as opposed to having to wait for a certain operative to be on rerun to farm their gear in an event shop. So in a sense, you're paying for the convenience of not having to wait, and to be able to farm these items at any time. Whether that's worth it is ultimately up to you. I would advise against chasing good logistics stat rolls through these permanent farms though, as it can quickly become prohibitively expensive.

But I still need to inflate the word count of this article (joking), so here are my personal thoughts on which logistics pieces and weapons are really worth your hard-earned stamina.

Logistics Sets

Weapons

If you have the signature weapon for any of the operatives listed, you should obviously be using that instead.

Weapon	Associated Operative	Verdict
Wild Wasp Stinger	Haru - Absconditus	A while ago, I did a lot of math to see how WWS shakes out against comparable competition. You can read that here, but the short of it is that a highly-duped Nexus or any tier of Yojimbo will give the bee blaster a decent run for its money. Or if you have Star Ocean, you should really use that instead.
Wave	Mauxir - Shadow Ka	Honestly not very impressive, as its attack boost isn't that amazing and takes quite a while to scale up as well. You'll likely get just as much value out of Frigatebird, if not more.
Wasp	Tess - The Magician	The only competition this weapon really has is Deep Sea's Call, which kneecaps Tess' ability to generate U-Energy in exchange for providing an attack boost. So if you find yourself not needing the U-Energy, I guess you can skip this. But if you don't need extra U-Energy, why are you using Tess to begin with?
Alpine Gentian	Katya - Blue Bolt	You really don't have any other option. Might as well. It's also the only source for a crossbow Scope attachment, so get one if you haven't already, even if you have Katya's signature weapon.
Rock Python	Eatchel - The Cub	An absolutely terrible weapon only saved by the fact that it's Kinetic and thus can activate Eatchel's M1 effect. Otherwise, just use Lapis Lazuli. As it turns out, even the free claws from Eatchel's M1 isn't enough to make this a better weapon compared to casting your support skill off cooldown with a T2 or higher Lapis Lazuli.
Halo of Hope	Cherno - Enigma	Cherno really wants an on-element weapon (Chaos) to take full advantage of her abilities, and no other SR weapon comes close to doing what this weapon does. 100 Battle Veteran does beat it out with the power of brute force stat checking, but that's also an SSR weapon.
Tribute of Rose	Enya - Exuvia	Most of its value actually comes from the fact that it's an Electric weapon, and thus can activate Areca Squad's two-piece effect. It does lose value if you're not using that logistics set, though, and could be substituted out for Prismatic Igniter in that case.
Wild Leer	Chenxing - Ethereal Cloud	Wild Leer kind of wins by technicality, as the SR assault rifle pool is pretty awful. The only weapon that even comes close is Indicator, and it doesn't end up working that well with Chenxing due to the diminishing returns of its weapon effect in combination with the logistics sets that Chenxing commonly uses.