When you are talking about standing out on a tarmac in bright daylight, I doubt any pattern makes a difference. However, a recent military channel program on camo development highlights that the biggest challenge is coming up with clothing that aids in cutting down heat and infrared signatures during night ops.
We have a decided advantage over most enemies due to our advantage in night vision.
U.S. BDU’s are treated to reduce infrared emission.
Maybe that’s the real reason for these frequent camo changes. They develop new IR resistance and don’t want to advertise it and to make sure that everyone gets the new stuff, they change the pattern.