Mars Callahan was born in 1971, in Studio City, Los Angeles, California, USA.
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Chuck Callahan was born on August 7, 1891.
Matthew Callahan was born in Chicago, in Illinois, USA.
Nikita Callahan's birth name is Nikita Carmen Callahan.
Peter 'Mars' Cowling was born in 1946.
Sgt. Callahan is played by Leslie Easterbrook.