From left to right: Action Man SAS Diver (okay, not USN SEAL but my first combat diver after the Deep Sea Diver), BBI Elite Force US Navy SEAL UDT "Stingray", Hasbro GI Joe US Navy SEAL with Limpet Mine
Dragon US Navy SEAL Combat Swimmer "Stan" and Kitbash US Navy SEAL HALO jumper (before Hot Toys released their superb SEAL HALO jumper and Night Ops Jumper)
SEALs are officially organized into eight teams of about 200 men and 50 officers, specializing in special ops with the ability to operate in all types of environment - temperate, desert, artic, jungle or urban. They are also trained for VBSS (Visit Board Search and Seizure) and are part of the four Naval Special Warfare Groups (NSWGs).
US Navy SEAL snipers - "3 shots, 3 kills" (link here)