The Deep Eyes Squadron in "Final Fantasy: The Spirits Within" has four members.
The squad is led by Captain Gray Edwards and includes Ryan Whittaker, Neil Fleming, and Jane Proudfoot. It is an elite military unit operating in a devastated 2065 Earth, where humanity is fighting alien life-forms called Phantoms. The soldiers help scientist Aki Ross and her mentor, Dr. Sid, investigate a way to save the planet.
The question can be confusing because the film also features other military personnel, including General Douglas Hein, and because the squad is sometimes described broadly as a military force rather than counted as a particular field team. The four named members are Gray, Ryan, Neil, and Jane. "The Spirits Within" was released in 2001 and was the first feature film in the Final Fantasy franchise, but its story is largely separate from the plots of the numbered games.