Silver Gryphon
(Is the chameleon circuit actually
broken, or does the TARDIS simply refuse to change into almost anything else?)
Would you rather be an employee of Torchwood or UNIT?
(As I understand it, the official line is that the Chameleon Circuit is broken. We don't know precisely when it happened, but the first time the Doctor was aware of it was when the TARDIS landed in the Stone Age but failed to change to blend in with its surroundings. Prior to this, it had been, among other things, an Ionic column and a sedan chair.)
UNIT
Would you rather remove an obstruction with care and precision or follow Ace's example and throw some homemade explosives at it?