The Hydrogen bomb made it's mission obsolete...............within a years time!...
The Yahoo article didn't give any details about Theodore "Dutch" VanKirk's record in the European and African theatres, where he also flew as Tibbetts' navigator. In a time period when surviving 20 missions over Germany was the price of a "ticket home," VanKirk and Tibbets and the rest of their crew flew 58 missions, including 11 from England, between August 1942 and June 1943 before returning stateside to train new aircrews. They began training for the Hiroshima mission in November 1944 and the Hiroshima mission was on August 6, 1945.
The Enola Gay's mission was to drop the first atomic bomb and the target was Hiroshima. Whatever came after that did nothing to make that mission obsolete. It ended a long, bloody war.
What the first hydrogen bomb (which was over seven years later, not within a year) made obsolete was the atomic bomb, which was a mere firecracker by comparison.
Bombs using the same fission design as the Hiroshima "Little Boy" bomb remained in service until 1952, when they were made obsolete by fusion weapons (hydrogen bombs).