http://www.usa-federal-forms.com/air...i11-2b-1v3.pdf
See para 7.15 -
"7.15.3. Aircraft Operations with One Engine Inoperative. Takeoffs with one engine inoperative from start of takeoff roll are prohibited. During emergency evacuation, launching an aircraft with one engine inoperative may be accomplished at the wing commander’s discretion or when directed by
higher headquarters."
AAR prohibited too...
Was there an evacuation from an as yet undisclosed airfield, or is someone making up new rules as they go along?