"The same four words, stitched into every uniform of every captain who takes their (sic) command: ..."
It seems that even the British, who supposedly know how to speak English, can not. The pronoun "their" is third person plural when it should be third person singular. It modifies "every captain" (singular) rather than "all the captains."
"The same four words, stitched into all the uniforms of all the captains who take their command: ..."
Oh, I just can't help myself! What is happening to the English language when even the British screw it up?