CREATE TABLE "program_details" (
  "name" text,
  "launched" text,
  "vehicle" text,
  "ceased_operation" text,
  "notes" text
);

Question: Which vehicle failed at launch?
SQL: SELECT "vehicle" FROM "program_details" WHERE "ceased_operation"='failed at launch';

Question: What are the notes regarding the scout x-4 vehicle which ceased operation in June 1971?
SQL: SELECT "notes" FROM "program_details" WHERE "vehicle"='scout x-4' AND "ceased_operation"='june 1971';

Question: What was the ceased operation with a launch date of August 8, 1968?
SQL: SELECT "ceased_operation" FROM "program_details" WHERE "launched"='august 8, 1968';

Question: What was the ceased operation that launched June 29, 1961?
SQL: SELECT "ceased_operation" FROM "program_details" WHERE "launched"='june 29, 1961';