This is an overview of the regular, recurring, and other characters of the TV series SEAL Team.

Main characters Jason Hayes

Master Chief Special Warfare Operator (E-9), Jason M. Hayes a.k.a. Bravo 1/1B, leader of a Navy SEAL team (Bravo Team), portrayed by David Boreanaz. In the series pilot, Jason is referred to as a Senior Chief Petty Officer. However, in the "Collapse" episode, he calls himself, "Master Chief."

During Season 3, Jason mentions that he joined DEVGRU in June 2001, just a few months before 9/11, thinking he was going to be a "peacetime SEAL", and has spent his entire career fighting in the war on terror. It is also revealed that he has twelve deployments in Afghanistan. A later flashback during the events of Season 5's "Nine Ten" revealed that his original enlistment was up in November 2001 and he was considering returning to civilian life, potentially becoming an emergency medical technician (having enjoyed the Special Operations Combat Medic Course) while Alana could go back to school and pursue her dream of becoming a lawyer. Those plans were ultimately scuttled after the events of 9/11, and Jason served as the junior team member/door breacher of the DEVGRU Team that took out the first high-value target of the Operation Enduring Freedom – Afghanistan.

In the pilot, Jason is still dealing with the loss of one of his best friends and teammates, Nate Massey, who was killed the previous December; he has also separated from his wife, Alana, in the intervening months, with whom he has two children, Emma (then age 16) and Michael "Mikey" (then age 11). Although he and Alana attempt to reconcile, she ultimately asks him for a divorce just before his deployment to Jalalabad, Afghanistan in early 2018. Later that year, Alana dies following a car accident in season 2's "The Worst of Conditions". Jason takes a leave of absence from the Teams and even considers resigning in order to ensure that his children at least have one parent left (it was mentioned that Jason and Alana had frequently made plans should he be killed in action, but never even considered that she might be the parent who died first), but Emma convinces him to stay on Bravo Team.

In the aftermath of "Forever War", Jason decides to transfer off Bravo Team; as of "The New Normal", he is assigned as the N3 Operations Chief for DEVGRU while waiting for his enlistment to be up. Jason later changes his mind during "All In" and returns to Bravo Team at the start of "A Cover For Action."

In Season five, Jason starts suffering from traumatic brain injury (TBI). Clay immediately notices this in the episode "Conspicuous Gallantry" when he pieced together what went wrong after an op went sideways and landed the whole team in the hospital; Jason was the one responsible for the incident, but he does not tell anyone about it. Jason and Clay's relationship is estranged in "Head On" after Jason believed Clay was trying overthrow him as team leader, though Clay was only protecting Bravo Team from Jason's reckless actions. Jason finally admits to Clay and Ray (who Clay told about Jason bringing down the building on Bravo Team) that he knows that he has TBI. Ray takes Jason to see Marc Lee, a former Army Ranger for help whose treatment routine helps bring him some closure over deaths of men he served with as well as his regrets toward his relationship with Alana. In the next episode, Jason and Clay make peace with each other. After rescuing Mandy Ellis, who was being held in captivity by terrorist in Burkina Faso, Jason and Mandy begin having relations with one another initially keeping it a secret from the others. After a bit Jason admits his going with Mandy first Emma and then Ray who both are glad with the news believing Mandy's common history with Jason could give him at last a chance at a happy relationship.

In Season 6 "Low Impact" BRAVO team is ambushed en route to capture a HVP in Mali and in order to take out the enemy pinning the team down from high ground Jason makes a one-man assault on the enemy hilltop position successfully taking the position allowing BRAVO to defeat their attackers and be evacuated to safety. However, during the fight Clay is severely wounded eventually causing is right leg to be amputated. Much of the season Jason blames himself for Clay's injury believing if Clay hadn't been there to keep an eye on his TBI he would have been at home away from the fight with his family. In Episode 3 "Growing Pains" Omar Hamza is brought in to replace Clay on BRAVO team and Jason is uncertain if he can trust him with knowing about his TBI and rumors of Omar's sour relationship with his former team leader at FOXTROT, giving aggressively unwelcome throughout their time in Syria tracking down the Syrian militia leader Yasiri, which comes to a head when in "Thunderstruck" Omar and Jason have shot at taking Yasiri out and Jason calls off the attempt as symptoms of his TBI set in and Omar believing Jason called it because he didn't trust him. Jason eventually decides to trust him and admits his condition to Omar who tells there was no need to keep that a secret from him saying his condition is pretty common with most operators. In "Fair Winds and Following Seas" Jason is awarded the Navy Cross for his actions in Mali and still grieving the death of Clay he decides to come clean to the whole command on the spot about his TBI the following scene he is about to be relieved of duty and unfit to lead BRAVO team by the command staff when Ray and members of the teams walk in to admit their conditions in solidarity.

Awards and decorations The following are the medals and service awards fictionally worn by Master Chief Hayes.

Personal decorationsNavy CrossSilver Star Medal, w/1 gold award star (2nd award)Navy and Marine Corps MedalBronze Star Medal with V Device, w/4 gold award stars (5th award)Purple Heart, w/2 gold award stars (3rd award)Joint Service Commendation MedalNavy and Marine Corps Commendation Medal with V Device, w/1 silver award star and w/1 gold award star (7th award)Navy and Marine Corps Achievement Medal with V Device, w/1 silver award star and w/1 gold award star (7th award)Combat Action Ribbon, w/1 silver award star and w/1 gold award star (7th award)Unit awardsNavy Presidential Unit CitationJoint Meritorious Unit AwardNavy Unit Commendation, w/1 gold award star (2nd award)Navy Meritorious Unit Commendation, w/3 gold award star (4th award)Service AwardsNavy Good Conduct Medal w/3 bronze service stars (4th award)Campaign and service medalsNational Defense Service Medal w/1 bronze service star (2nd award)Armed Forces Expeditionary Medal, w/3 bronze service star (4th award)Southwest Asia Service Medal, w/2 bronze service star (3rd award)Kosovo Campaign Medal, w/1 bronze service star (2nd award)Afghanistan Campaign Medal, w/1 silver service star and w/1 bronze service star (7th award)Iraq Campaign Medal, w/1 silver service star (6th award)Marksmanship awardsNavy Expert Rifleman MedalNavy Expert Pistol Shot MedalOther accoutrements Special Warfare insignia Naval Parachutist insignia 5 Service Stripes (reflecting 20 years of service)

Clay Spenser

Special Warfare Operator first Class (E-6) Clay Spenser a.k.a. Bravo 6/6B, a second-generation Navy SEAL. He's portrayed by Max Thieriot.

During the first part of season 1, he is a member of Green Team training for Tier One status, and his readiness for combat is questioned. His attitude changes after he loses his friend and fellow trainee Brian Armstrong during a parachuting training accident in the episode "Collapse". In “Other Lives” he meets Stella, a grad student and the two soon begin dating. He becomes a member of Bravo Team at the end of "The Exchange".

In season 2, he briefly served as the team's second-in-command following Senior Chief Ray Perry's assignment to Green Team. After being injured in "Paradise Lost", Clay returns home to the United States to recover, during which time he makes it his mission to ensure that a fellow Navy SEAL, now retired and suffering from traumatic brain injury, could receive a Purple Heart.

During the events of Season 3 – particularly after meeting Ambassador Marsden – Clay begins to wonder how he can "point the spear, not just be the tip" (i.e. have some say in what missions the SEALs, especially Bravo, are deployed). In "The Strength of the Wolf", Master Chief Hayes and Senior Chief Perry speculate that in 10 years, Clay will be leading Bravo Team. In "Rules of Engagement", CAPT Lindell volunteers to nominate Clay for STA-21, one of the Navy's officer-commissioning programs; after spending a few weeks thinking about it (and although the nomination does not go over well with Jason or especially Sonny), Clay decides to explore the option of possibly becoming an officer.

In season 4, after coming forward in "Forever War" admitting to writing a letter to Ambassador Marsden's husband that was given to the media after the State Department declared Marsden a rogue diplomat in order to cover up Ray's participation of the act, CAPT Lindell immediately revoked his STA-21 nomination and assigned him to a desk job in the Logistics Division - and in "The New Normal", Clay is told that he will be able to operate again in the near future, but it will not be with Bravo Team. Clay's suspension from Bravo was temporarily rescinded after Jason volunteers himself and Clay to join Bravo's rescue efforts to save Ray from enemy captivity. Shortly after the rescue mission, Clay's suspension from Bravo was removed on a permanent basis. He and Stella start dating again and they get married at the end of the fourth season.

In Season 6, Clay's right leg is amputated from the knee down after being seriously injured during a mission with Bravo in Mali. Clay decides to join Green Team as an instructor to teach recruits. After Clay struggles with recovery and his altered physical ability, serious depression leads him to take a leave of absence when his emotional turmoil causes him to run from Stella and their son Brian. After Sonny, Jason and the rest of his Bravo "brothers" help him through this struggle, Clay decides to spend some time at Ray and Naima's veteran outreach facility where he de-escalates a troubled former Air Force drone operator named Ben. As Clay spends time with Ben, his priorities shift and he ultimately decides that perhaps it is time to leave Green team for good and so he asks Stella what she would imagine for their future away from the teams. Clay decides that maybe it would healthier to move on with her entirely when he receives a phone call from a troubled Ben. Clay stops Ben from vandalizing the Air Force recruitment center that "tricked" him and ultimately from committing suicide. Just as Clay gets Ben to relinquish his firearm, a security guard shows up and surprises Clay and Ben. Seeing the gun in his hand, the guard shoots Clay through the heart killing him instantly.

Clay had four deployments in Afghanistan, two with Team 3 and two with DEVGRU Bravo Team.

Awards and decorations The following are the medals and service awards fictionally worn by SO1 Spenser.