I study military history quite a bit and quite a few officers, in WWII that were in combat that wore their collars to hide rank. Most write of carrying Garands or Thompsons to hide the fact that were officers. Support and indirect personel carried carbines but some officers chose not to carry one for they believed it made them look like officers. That and the firepower aspect of it. Nothing like rank being spotted by a sniper.
Of course there were many that did the opposite.
"...Our natural, inalienable rights are now considered to be a dispensation of government, and freedom has never been so fragile, so close to slipping from our grasp as it is at this moment.” Ronald Reagan
"Those who beat their weapons into plows will be plowing for those who don't."