Jakey,
No doubt Occam's razor would convince the Trojans that the wooden horse was safe to bring inside the walls of the city - it couldn't possibly contain some Greek troops that would come out at night and open the city gates...
Ruse of war - Wikipedia, the free encyclopedia
While not saying it applies in this particular case - adopting the profile of an airliner has been used by military aircraft to obtain a tactical advantage, indeed as a concept it appeared in commercial print as long ago as 1966:
The Penetrators by Anthony Gray - Reviews, Discussion, Bookclubs, Lists
I would suggest that relying on Occam's razor when making military decisions is a somewhat flawed policy!!