I still need to wrap up my reboot customs to post a huge thread with my new Joeverse, but it boils down to origins. Most of the team had history with other members, so when Hawk started piecing the team together, a lot of members were recommended by others.
Joe Colton's team (10-12 years ago):
LTC Joe Colton - Team Leader (now retired)
MAJ Lawrence Flagg - XO (now Brig Gen)
SSG Conrad "Duke" Hauser (now SGM)
SSG Dash "Flint" Faireborn (now CW3)
SSG Charlie Iron Knife (now retired)
SGT Lonzo Wilkinson (now MSG)
SGT Marvin Hinton (now MSG)
CPL "CLASSIFIED" (now GS-13)
SGT Athena Jackson (original character - now part of the Adventure Team)
Supporting Joe's team were:
COL Clifton V. Mewett (aka- Colonel Courage) - Joe's CO
CPT Carl "Doc" Greer - Team Doctor (KIA)
1LT Jane Martelle (later Colton) - Team Nurse
CW3 Bill Hardy - Pilot (now retired CW4)
The "Squad" (5 years ago):
SSG Robert Graves (now CPT- Joe team XO)
SGT Craig McConnell (now SFC)
CPL Ralph Peterson (Steeler- name changed because I'm changing his ethnicity/backstory) (now 1LT)
SPC Lance Steinberg (left to have a NASCAR career, now back as SSG)
PFC Alvin Kibbey (Signals Intelligence augmentee from NSA) (now WO1)
Ranger/HALO school (4yrs ago)
SGT Wallace Weems
SGT Wayne Sneeden
SPC Franklin Talltree
SPC Ron Tadur
Aberdeen Weapons Lab (3 years ago)
MAJ Clay Abernathy
SSG Craig McConnell
SGT Anthony Gambello
SGT James Barney
I put a good chunk of the Joes in staff positions as if they were a real unit- you'll notice a lot of new Warrant Officers - for those unaware, I might have spent a decade or more as a Warrant myself, and have led staff groups, so it makes sense in a small team like the Joes:
Hawk: LTC, Commander
Grunt: CPT, XO (went to OCS and was a Ranger Platoon leader when recruited by Hawk)
Duke: SGM, Senior Enlisted Advisor
Flint: CW3, Operations OIC
Roadblock: MSG, Operations NCOIC
Ace: CPT, Air Operations OIC (gender-swapped)
Lady Jaye: CW2, Intelligence OIC
Breaker: WO1, SIGINT, S6 (signal/infosec/cyber) - all things comms-related
Steeler: 1LT (prior enlisted -OCS grad after a couple of years on the Steelers practice squad), S4 OIC (logistics, motor pool)
Torpedo, CWO4 (ret) - recalled as a civilian - head of Sea Ops
The rest of the team fills out their roles more or less like the comics, except there are no "specialty" troops that don't have real specialties (Desert Troop, Jungle Troop, Ranger, Airborne, etc) - nearly every Joe is Ranger/SF qualified and every Joe can operate in any environment, so people like Dusty, Ripcord, Beach Head, Stalker, etc are operators without any real specialties. Ripcord & BH are HALO jumpmasters and Stalker is the top linguist on the team (along with Breaker), but they're primarily assault troops.
Scarlett & Snake-Eyes are government civilians, rather than military. Scarlett because she's an agent and SE because he's, uh... classified or something and also legally dead.
Snake-Eyes was on Joe's original team (lowest-ranking member) and is extremely close to Stalker & Flint, who view him as their "little brother"
Lots of retired folks called back to help: Spirit, Torpedo, Wild Bill - I wanted them to be the crusty old farts that other old farts like Duke & Flint still look to for advice.
Cobra:
Cobra Commander - early comic version - not a buffoon, but a clever tactician & strategist. Unknown if he was a businessman (used car salesman), politician, part of the hollywood elite, or even former military. He pulls the strings behind a number of efforts to sow chaos (tampering with elections, spreading misinformation on social media, talk radio programs, stock market manipulation, etc) - He was originally out to get those who "wronged" him (sort of like the comic CC who was mad about his brother's death), but then enjoyed all the money & power that came with the role.
Destro: used to be neutral to play both sides, but hooking up with the Baroness shifted his loyalty. Has a fake sense of "honor" when it suits him, but he's an unscrupulous pre-Iron ManTony Stark, basically.
Baroness: Spoiled brat - not an aristocrat, just a billionaire's daughter. Became a terrorist because she was bored, then discovered she liked killing & causing chaos.
Serpentor: Super-solider, not an "Emporer" - created with CC's full involvement/endorsement. Has a "kill-switch" implanted just in case he gets too ambitious. Completely loyal to the cause.
Dr Venom: still alive - no Mindbender in this verse, just Venom & Cassandra Knox doing all the Brainwave Scanner/BAT Technology/Venomization stuff.
Tomax/Xamot: Actually just Xamot as an only child. Accidentally killed Tomax as a child and now has visions of his dead brother and multiple personality disorder.
Zartan: no shapeshifting, no chameleon crap, no nanobots, not a ninja, never involved with SE/SS, just a former actor/stuntman who is an expert with make-up, holography, and other methods of disguise. Basically RDJ's character in Tropic Thunder - gets WAY too deep into his roles, but it pays off.
Storm Shadow: more of a Yakuza-type - infiltrated Cobra to get information about the Arashikage clan's criminal dealings (more on that below) and went down the rabbit hole, not caring who got hurt.
Arashikage clan: (Red Ninjas) Bad guys - criminal organization that posed as an "honorable" sect when they recruited Snake-Eyes as a teenager (his dad was a diplomat in Japan). SE & SS were very close and both unaware of the clan's underworld connections. Soft Master killed SS's father (who didn't want to be part of the criminal activities) and had the Hard Master killed to ascend to the top spot and framed Storm Shadow. He also had Snake-Eyes' family killed to drive him back into the arms of the clan after SE decided to stay in the Army. -- Seriously, I have like 8 pages of storyline on this that I need to post one of these days
Cobra-La: Fake "immortals" created by Venom to start a "snake cult" to help recruit more weak-minded individuals to Cobra. Because idiots will believe anything. Because of their mental programming, the Cobra-La members don't know that they're just a publicity stunt - they truly believe the stories implanted in their minds.
Long story short- lots of interconnections. Not quite as bad as Snake-Eyes' parents were killed by CCs brother and the two became friends for a while and also SE was there when the Baroness' brother was murdered and by the way Zartan, Firefly, and others were all ninjas this whole time, though.