For us flying an F-4 with no computer and dropping unguided iron bombs, the calculations were already done before the flight. The classified F-4 Tactical Manual had a number of pages containing graphs for bombing. Each of these graphs would be for a specific weapon and for a specific dive angle. It would tell you the entry dive altitude, the degree dive angle, the necessary speed, the ‘pickle’ altitude, and the pull out altitude. We would then set a proper mil setting in our iron gun-sight in the aircraft for the calculated run.

Since for the majority of bombing runs we did the same exact run every time with the same Mk-82 bombs, there was not really a need to go to the manual’s graphs and calculate the run every time. We had it memorized.

It has been many years, so this may be a little off but this is how I remember when hitting very heavily defended targets: Roll in around 11,000ft/3352m, establish a 40 degree dive angle and 500 knots, pickle at 5,000ft/1524m with the gun sight pipper on target, and pull out by 3,500ft/1067m to stay out of small arms fire.