Not very big but quite stupid:
1.) During MTKS-SAT deployment in Mars orbit I forgot EVA spacialist and returned to Earth leaving him near the satelite.
2.) Landing Apollo Capsule in Himalay Mountains.
1.) During MTKS-SAT deployment in Mars orbit I forgot EVA spacialist and returned to Earth leaving him near the satelite.
2.) Landing Apollo Capsule in Himalay Mountains.