Scott Kenny
ACCESS: Above Top Secret
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If the C-5Cs are kept in a hangar when not in use (unlikely, I know), they can have visible external modifications.Note the earliest reference I can find to a "modified C-5" in this context is:
Mark Farmer, "Not So Secret Weapons" , Covert Action Quarterly, Spring 1995, No. 52
With a reference to:
I may be incorrect, but I do not believe that the C-5C modifications are externally visible - an observer would not be able to tell a C-5C from a "normal" C-5.
Also, depending on just how significant those modifications are, some careful countershading painting can help hide them from distant viewers.