I guess I should have elaborated.

I have only ever heard the comand in countrysides and farm areas. You can see the dogs running around after sheep (yes, sheep) and his/her owner will shout "Combine!" several times.

Note: I'm English so it may be a British only expression? (Which of course means a Japanese company such as Sqaure won't even know the term, so it may not be a mistake after all.)