Heterosexual British Actors in Military Roles in American Films:

Michael Caine
Sean Connery
James Mason
Robert Shaw
Alec Guinness
Trevor Howard
Anthony Quayle
Jack Hawkins
Richard Burton
David Niven
Errol Flynn (NZ)
Walter Pidgeon
Basil Rathbone
Ralph Richardson
Christopher Plummer
Michael York
Harry Andrews
Michael Redgrave

I could go on. But, I think you can see that British soldiers portrayed in American films are done so by rather masculine, heterosexual actors.