As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT FROM BASE, PILOT AND CREW NOTICED AN ODOR SIMILAR TO BURNING RUBBER. ODOR WAS NOT STRONG BUT APPEARED SUDDENLY. NOTHING ON THE GROUND IN THE VICINITY OF THE ACFT WAS OBSERVED BURNING. ABORTED MISSION AT 1-2 MILES OF BASE. ODOR DISAPPEARED DURING TURN TO AIRFIELD. NOTHING WAS FOUND OR REOCCURRED DURING MX CHECKS AND FLIGHT CHECK.