Friend of mine was driving a Beaver one day, admiring the view, when some of the locals took exception to his scenic tour in that part of the Province ...this upset him a bit, so, a couple of days later, he took the same scenic tour but this time, invited some friends on the ground along to watch his flying skills ...seemingly, thereafter, his scenic tours of the area continued undisturbed .
As for BDR / Expedient repair, as somebody who participated in the, very, embryonic basic trials and development in Germany, and whilst some of our basics remain, the development of the techniques and materials used, along with the rapidity, makes for a fascinating "contrast and compare " exercise....came in useful it seems.