Actually tanks can, and usually are concealed. Otherwise they are too good a target for aircraft. I will say that the most accurate gun I've ever fired was a 105MM. Took out a ground squirrel at Hunter Liget at a lasered 7 miles, no problem...
Anyone know if the 105MM was really just about flat shooting at that range, or, if it was just the sighting system was so good, you put the target in the cross hairs, and, it disappeared???
Anyone know if the 105MM was really just about flat shooting at that range, or, if it was just the sighting system was so good, you put the target in the cross hairs, and, it disappeared???