Rocket assisted
We used ATO on C130D ski operations in the Arctic in the late 60s. On the Greenland ice cap it was often too difficult to get the nose ski to un-stick even with violent rocking of the stick over its full range and with all bleeds off. One would reach about 70kts and if you could not accelerate further, fire off all four ATO bottles at this point which would usually (but not always) give you enough extra surge-urge from 4000 lbs of thrust to get airborne. If it didn't work (loud groans from the F/Eng as he had to go back and lift four new bottles on to the lugs forward of the rear para doors and they were damned heavy at 9000 ft AGL) one taxied back in your own tracks and had another go! The bottles burned for about 17 secs.
The USN operated later model ski 130s in the antarctic with more umpf. Now if we had had Dash 15 engines a la K with skis I doubt whether ATO would have been required. Happy days