The Navy SEALs, are the U.S. Navy's primary special operations force and a component of the Naval Special Warfare Command. Among the SEALs' main function is to conduct small-unit maritime military operations that originate from, and return to, a river, ocean, swamp, delta, or coastline. The SEALs are trained to operate in all environments (Sea, Air, and Land) for which they are named.
On the Show
On NBC's Blindspot, the Navy SEALs are mentioned when it is discovered that the black square tattoo on Jane Doe's arm was made in order to cover her previous SEAL tattoo. This suggests that she was a member of the Navy SEALs; however, it hasn't been clarified and no other members have been mentioned or shown during the show.