The SR-71 flight manual can also be found here [0].
I was surprised to find the plane can be flown solo [1], and with no pressure suit below 50,000 feet [2].
There is also a section on "Tactical Limits" describing scenarios where exceeding normal operating limits is advised to exit a hostile area [3]
0. https://www.sr-71.org/blackbird/manual/
1. https://www.sr-71.org/blackbird/manual/5/5-23.php