Swat

First, how many do they have in the squad: A military squad typically consists of between 8 and 14 soldiers, according to Wikipedia and other sources. The exact number can vary depending on the military branch and the squad's specific function.
Breakdown:
U.S. Army:
A squad typically has 9 soldiers, divided into two 4-man fire teams, with a staff sergeant in command, according to Quora.
U.S. Marine Corps:
A squad may have 13 Marines, divided into three 4-man fire teams.
Other Forces:
In other militaries, a squad can range from 8 to 10 men, or even as many as 14.
Specialized Units:
Weapons squads, for example, can have between 3 and 8 men, depending on the weapon crew, according to Wikipedia.
All members of this squad are men, their personalities are not very well defined and they may even all have the same personality. None of them have their own name or a well-defined appearance, they usually wear their vests and it's difficult to see them without them.

SWAT, which stands for Special Weapons and Tactics, is a law enforcement team specializing in high-risk situations that exceed the capabilities of regular law enforcement units. These situations may include hostages, barricaded suspects, high-risk arrests, and riot control. SWAT teams use specialized techniques and equipment, including military weapons and tactics, to handle these critical situations.

SWAT teams are deployed in situations where the lives of civilians and/or police officers are at risk, such as hostage situations, shootings, or when dangerous suspects have barricaded themselves.
Training:
SWAT members are selected and rigorously trained for special operations, including negotiation techniques, hand-to-hand combat, explosives handling, and other specialized tactics.
Equipment:
In addition to weapons and tactical equipment, SWAT teams may have armored vehicles, drones, and other specialized tools to respond to different risk scenarios.
Origin:
SWAT teams emerged in the 1960s in the United States as a response to rising urban violence and the need for better equipped and trained police units to handle critical situations.

Availability:
Today, most police departments in large and medium-sized cities have SWAT teams or similar units, and SWAT teams also exist at the federal level in agencies such as the FBI, the Secret Service, and the Border Patrol, according to Criminal Justice Degree Hub.
Equipped with helmets, bulletproof vests, and specialized weapons, SWAT team members use armored tactical vehicles and advanced technology to protect themselves during their operations. Regarding their nature, it is important to note, as mentioned, that they are police units, although their training and equipment are similar to those of military forces due to the nature of their missions.