Summary Answer:
Muslim scholars teach that Muslims should generally be truthful to each other, unless the purpose of lying is to "smooth over differences."
There are two forms of lying to non-believers that are permitted under certain circumstances, taqiyya and kitman. These circumstances are typically those that advance the cause Islam - in some cases by gaining the trust of non-believers in order to draw out their vulnerability and defeat them.
My question is: Why a secret mission to save this one guy? There have been many individual westerners kidnapped and executed over the years by these Islamic vermin and did we hear of military assets being used to attempt to rescue them? Pundits arguing over the wisdom of divulging this fantasy ‘secret’ operation is just another distraction.