When I was a Cub and Boy Scout many moons ago, we either 
  
a) tucked our shirt collar in and wore the neckerchief w/slide 
b) got a BSA shirt without a collar  
  
Now some 30 years later, I see the collar being worn over the neckerchief, which made me yelp like a dog getting its tail stepped on. 
  
Which is correct?  Under the collar?  Collar tucked in? 
  
IMHO, if you want your collar out, get a bolo.