In college, a good friend of mine needed a logo design. It was for a drone he and his team were building as part of their engineering Senior design project. For inspiration, I turned to vintage NASA mission badges/patches, as well as old National Park poster designs.
Preliminary drafts/sketches (left) and round 1 designs (right):
Round 2 designs (left) and round 3 designs (right):
Final logo, as picked by client: