That's on a 2 mile long runway I presume. I used to watch them taking off while standing fairly safely by an ATC radar.
“Normal take-off was to 1,000 ft remaining pull back on the stick and hope to God it flew.
That’s on a 2 mile long runway I presume.”
Or more... I got to fly on a mission out of Minot in ‘70. We were to escort the Thunderbirds across the country and had a pretty full load. The calculated takeoff roll was 11,800 feet. I asked the pilot how a warm summer day would affect that. He said, “We wouldn’t make it.” As I recall, the runway was 13,200 feet.