TLDR -- all of the crossfield options are expensive; 3/4 variants are a part of expensive C-Store bundles [they come/go from time-to-time in the store]. If the Mirror Crossfield is the specific variant you want, the 13th Anniversary Terran Bundle is what you want to buy in the C-Store (wait for a bundle sale first though...) Mirror Crossfield requires buying the 13th Anniversary Terran Bundle (17.5k zen non-sale) Legendary Crossfield requires buying the 10th Anniversary Legendary Bundle (30k zen non-sale) OG Crossfield requires buying the Mudd's Primary Faction Choice Pack & choosing that starship as one of the options. (29.5k zen non-sale) Crossfield Refit (the 32nd century one) isn't available outside of lootboxes at the moment. IMO the 10th Anniversary bundle has the best Crossfield (EPG & Sci-Torp), though the 13th gives the DEW-Sci Mirror Crossfield + 3 starships that stand up to modern STO (Eagle for torp, Hydra for DEW, Styx for tanking). 10th Anniversary is recommended for the # of starships in it, the 13th Anniversary Terran Bundle is recommended due to the Styx typically (though the current high-end meta is 1 dps player + 4 Siliban Silik FDC's)

EDIT: I misread how I organized the GoogleSheet for this presentation (link in video description). In the document, the Bolded traits with stars are the "forced" traits -- I had originally read the sheet as the left 2 traits being forced & the right 2 traits being RNG if they were RNG; sorry for the confusion! I'm surprised I skipped it in the video slideshow & technical rankings in the GoogleSheet, as I have it in the notes on the Lethean race & in the theoretical best traits possible section for each race. It is a "D" trait when I ranked these a long time ago; if I was actually to redo these rankings, its probably borderline between C-tier & B-tier as a trait (so you could add 1-2 pts to what you see in my commentary below). If you look at the theoretical best bridge officers for ground & exclude one-off officers (aka officers you can only have one of, like the holographic bridge officers, androids, etc), I value the following quite highly due to their reliability to get: (1) Alien Female Science officer -- Qo'nos First City Bridge officer vendor (200 dilithium each & 17 pts "A" officer). IMO the bridge officer upgrade token is most valuable on these officers, as her traits are all basic or standard but really good & all upgrade to superior. There are 2 options for alien female science, so choose the right one & you can purchase as many as you want. (2) Fleet VR Romulan Male/Female Science officer -- Fleet Embassy (40k dil & 160k fleet credits, 14 pts "B-" officer due to a dead space trait). This officer is the more expensive FED replacement for the KDF alien female officer, though this officer also comes with all superior traits, so no need to upgrade them. (3) Fleet Krenim Male/Female officer (any profession) -- Fleet Research Lab (40k dil & 160k fleet credits, 14 pts "B-" officer if you RNG into the Creative trait -- it is not a guaranteed trait on them unlike what the wiki says). Science Krenim on-par with VR Romulan fleet officers but less reliable to get the combo you want for traits (romulan ones are 100% for the traits you want). (4) Betazoid Female Science officer -- ESD Bridge officer vendor (200 dil each & 15 pts "B" officer). This is the cheap bridge officer replacement in strength for FED captains to what the KDF have in their alien female science officer option. Less flexibility in customization but still a solid officer. In contrast: (5) Lethean officers -- (Exchange RNG, up to 14 pts "B-" potential) if they have Creative & Telekinesis traits on them, they are worthwhile officers; weak officers otherwise.

TLDR for a KDF captain that is min-maxing their away team while keeping all KDF -- to be honest, your bridge officer abilities make a greater difference than their traits -- though stronger traits do make things MUCH EASIER for them to carry you. (see the "Away Team Setups Made Easy" video if you want ideas on that front). Should be easy to search if you haven't seen it, its the video I feel holds up best of all my videos over the years (besides the introduction). I'd recommend having 2-3 of the alien female science officers (with the good traits) from the Qo'nos first city bridge officer vendor + putting good ground abilities on them. This is probably the least talked about secret in the game honestly -- and looking back, I am really surprised I skipped over this in the video. From a value-to-cost perspective, they are the best reliable cheap officers in the game for ground & KDF-exclusive. Orion Female officers, if you can RNG them to have Creative & Peak Health traits alongside their forced Seductive & Seduce traits, are on-par in strength (17 pts "A" tier) to the 200 dil alien female science officers, but those are the rare KDF officers that WILL BE EXPENSIVE on the exchange... From there, any engineering officer with a variant of the "creative" trait is good enough. To be honest from a value-to-cost perspective, Lethean probably is the best here if you can get both Creative & Telekinesis on them -- and as an "ugly" race they shouldn't be that expensive to buy. Don't expect to find the trait combo easily though. I personally prefer the survival that the Lifetime Veteran Android officer gives for most of my captains, though that is a premium from a Lifetime subscription that isn't really worth it in today's STO. As I note in the Away Team Setups Made Easy video, a tactical officer isn't necessary -- though I like to have one from a personal preference. Lethean could also fit here, though K'Gan is about as good as you can get KDF-wise otherwise. The best orion female traits aren't synergistic with the "suppressing fire" ability of tactical officers -- the one tac ability I personally value them to use correctly. Aside from the gold mine of traits on a KDF alien officer from the exchange (Creative + Telekinetic + Aggressive + Acute Senses for 18 pts "A") or origin females & letheans from the exchange, the other KDF races for bridge officers don't have good traits for ground honestly. Nausicaan is a space-only bridge officer (& only on a budget), Gorn is just the worst race in the game for officers (besides Thraak, the lone gorn with Creative as a trait),

Not in Solasta unfortunately -- which makes subtle spell metamagic (added to the game after this video was made) much more valuable.

@@CounterYoloGaming I see, thanks for the reply! That would also make the Metamagic Adept feat more valuable (so non-sorcerers can get that), but unfortunately it seems that feat is not in Solasta (at least it's not in the feat lists I've checked).

Glad you enjoyed it! I'm not really considering making a new video at the moment, as my suggestions still work in 2024 STO for ground combat on elite difficulty; you don't need to get kit frames for bridge officers (via elite bridge officer upgrade so they can use them, which is just a cash grab & waste of in-game currency honestly) nor upgrading to mk 15 weaponry for bridge officers, as their AI is still bad for using them. I technically could do an update video for ground captain builds -- as that has changed a bit with more power options for them the past few years -- but others in the STO scene have covered that quite well honestly.

As long as they are in your bridge officer seats on your starship for space traits (or on your away team for ground traits) -- not just in your list of bridge officers -- then yes they will stack. I'd personally say the Leadership trait's stacking of resistance to subsystem offline is still much more valuable though.

@CounterYoloGaming Thanks for the info! 😁👍🏻It gets so confusing in game because the stats don't show the changes. The expose rating is just sitting at 205% no matter who I have on the team. I wish they'd work on that. It's buggy in space too becsuse it doesn't show in some places. I find all these traits valuable so far. I love the rapid regeneration and resistance. Speeding off and recovering so fast is awesome. I stack up all the hull recovery skills to enhance it. The expose chance works great with pistols and sniper weapons, especially when coming out of stealth. They don't know what hit them.

@CounterYoloGaming I've been doing some testing, this exploit bonus definitely doesn't stack. My stats only show 205% and the damage hasn't gone up at all. If anything I seem to be hitting weaker than normal right now. I'll try to figure this out. The game is pretty buggy though, I set my entire team with melee expose weapons with superior Luck and no ones getting exposed. I should be seeing nonstop exposes with this setup. I don't suppose they needed pistols recently?