The following guide is tailored to the Lore of Jagged Alliance and setting the Mercs together that have some sort of history with each other or works best together and so forth aimed towards boosting the Moral as much as possible.

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The Following teams are matched up to which im presuming wont cause In fighting with other members and/or making moral take a nose-dive.
<for example if i remember rightly, Having Raider, Raven And Hitman in the same team in JA2 and ignoring the warnings about getting them away from each other, i think Raider Kills Hitman>

(Not sure if the same would/will happen in JA3 but testing will need to be done... at one point... to find out if they do.)

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Teams of 6+
*To get the boosts from all 7 members you would need to do the following ways
Unmodded - 1x 6 Merc Team and 1x 1 Merc Team in the same sector
Modded - use the "Custom Settings by Tobias" to tweak "Max Merc Party Size" to 7*

Dr. Q, Livewire, Vicki, Gus, Len, Scully and Spike

Blood, Ice, Kalyna, Omryn, Thor, Magic, Smiley

Buns, Grunty, Hitman, Igor, Ivan, Scope, Sidney

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Team of 6
*No extra teams in a sector or modded team sized needed.*

Fox, Grizzly, Nail, Tex, Wolf, Shadow

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Smaller Teams
*Those few Mercs only boost each other or, only boosts once and ends.*

Fidel and Pierre like Flay, Flay's doesn't care enough

Raider And Raven Boost Each other

Steroid Likes Larry, Larry Doesn't Care
Reaper Likes Fauda, Fauda Doesn't Care
Barry Likes Red, Red Doesn't Care

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Black Sheep
*The following Mercs doesn't have anyone who they prefer working with.*
MD (Dislikes Flay)
Mouse (Dislikes Steroid and Red)
Meltdown

*Meltdown appears to be the only merc no-one has an issue with, or so im presuming from
"Mercenary likes, dislikes and hiring conditions" By PVA
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If anyone knows if there is anyone "MD", "Meltdown" and "Mouse" prefers to work with, along with any team-ups ive got incorrect or missing... Please let me know and ill update accordingly and throw you a thanks in the credits.

Cheers

To PVA for their Guide
"Mercenary likes, dislikes and hiring conditions"
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=3007594221

For which the guide helped me get in order which Merc likes and dislikes who, all i needed to do was order the teams into which "appears" to not conflict with each other.

To Tobias for their Mod
"Custom Settings"
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=3007587788&searchtext=custom

For which i was able to tweak the Merc party size up a touch.