The amount of advancements made in the shooting world since 9/11/01 is amazing . In the 60's and 70's scopes were in their infancy still , small tubes small objective lens , most were fixed power . The military scopes of the day as with a lot of their equipment didn't have any identifying markings on them as to who manufactured them . The scopes from Europe , Russia and China mostly had 3 pointed posts for your eye to find center . When you adjusted them they may have 1/2 , 1/4 or 1/8 inch adjustments and with the threads being rough and cut on manual machines they may or may not be accurate . The first scope that I was exposed to had been repaired so it had a square knot tied in the vertical wire for the reticle near the bottom of it . It was ok for training though . With no markings on it I'm not positive but think it was most likely made by Weaver had a steel tube , brass erector tube and was a fixed 10 power . There were the ones that you couldn't mistake who made them Unertal they weren't really fixed in place but had to be slid back into place after firing a round . I had one that had coated lens where the coating began to peal and wrinkled so you couldn't see through it . It had a rectangular shaped ocular lens and was most likely a Redfield wide view again in a fixed 10 power . They all had second or rear focal plane reticles and the subtendions may or may not have been accurate . In todays world of optics the scopes are better built having better glass , coatings , construction , etched reticles that are very precise the lens are bonded in place , the threads are precision cut on CNC machines , and mostly do as advertised the erector tubes are more stable the tubes are bigger and the light gathering properties are at or very near the best they can be . Variable power that is repeatable is the thing now and you may struggle to find a fixed power scope , eye relief is in a broader range , you have the ability to adjust the parallax , diopter adjustments are easily made they have gas filling , fog free , they work well in a wide range of environments ,hot dry or hot wet cold and dry or cold and wet , the coatings stay on the lens and are better in general , the tubes are built out of lighter materials that tolerate extreme conditions salt water dirt and dust ect. Scopes of today will stand up to more abuse then the scopes of yesterday . The world of today is prime times for long range shooters and there are more well trained shooter in the world today then at any other time in the history of firearms . They have access to so many aids to help them achieve precise shots , range finders are hand held and accurate now not the 200 pound 5 foot monstrosity that they at one time were . The ability to see at night is another field that has seen great advancements IR's aren't big awkward units thermal units are better then ever before light gathering and enhancement all this has had more study done then ever before . There is more training material out there for the public then ever before . Even the bullet of today is better then the bullet of 20 years ago more studies on flight , materials powders and even case design and material has made advancements . The actions of todays bolt action rifles are better built with tighter tolerances and different material being held to tighter allowable content of the components mixed to make the metals there are things such as heat numbers and mill spec sheets so that each batch of steel shipped to the manufacture can be traced and accounted for all making todays shooting world the best it's ever been in the free world . The process of manufacturing them has became better as well it still takes a person to set it all up and run the machines but so much of the human error has been taken out of the equation .