During a practice run of a missile launch, one of the X-17As failed in flight, after only twenty-five seconds. Had there been a nuclear weapon in the nosecone, it would have produced a catastrophic disaster. The missile would have been just a few thousand feet up, and exploding at that height would likely have killed or injured many of the crew. Making matters seem even more precarious, in the following test run, the missile failed again, this time just three seconds after launch.