Thanks for posting that visual aid. If the box leaning on the window sill was in that position when the JFK Limo passed by, it would serve No Purpose other than as a rifle rest. That box certainly is Not bracing the stack of boxes positioned behind it, as the box is not jammed between the stack of boxes and the window sill. A possible legit shooter in that window would also then mandate a Spotter. If this tandem were prepared to alternate between the roles of Shooter and Spotter, 1 shooter would then use that box on the window ledge as a rifle rest for a shot(s) down Houston St. If a shot or shots down Houston St. was nixed for some reason, then the Spotter for the Houston St shooter morphs into a shooter and uses the stacked boxes as his rifle rest for a shot(s) down Elm St. This possible 2 different shooters would most likely involve 2 different rifles. (1) Carcano + (1) Mauser.
There was no sniper behind that SE corner window, and there were no shots fired from that site!
Howard Brennan said that he saw a man who was dressed in light colored khaki clothing STANDING and
AIMING a high powered rifle ( possibly a 30 30 Winchester) from a window on the sixth floor of the TSBD. I believe that he did.... BUT...I doubt that the man fired the rifle.... I strongly suspect that there was a "security guard" ( a man dressed like a deputy sheriff) who was on the sixth floor prior to the arrival of the motorcade. This "security guard" had several functions to perform ...A) Stick his rifle from the window at the time the ambulance crew were loading up the seizure victim...And B) ...toss a couple of spent carcano shells on the floor beneath the window...and... C) hide a carcano somewhere near the logical escape route for a assassin.....D) prohibit any TSBD employee from being on the sixth floor....