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VANDENBERG AIR FORCE BASE, Calif. (AP) - The U.S. Air Force has launched an unarmed intercontinental ballistic missile from a California base, a month after the test flight was postponed because of tensions with North Korea.

Vandenberg Air Force Base says the Minuteman 3 lifted off at 6:27 a.m. PDT Wednesday. It later splashed down thousands of miles away in the Pacific.

It's the first Minuteman test-launch of the year. Several Minutemans are launched each year at from Vandenberg to determine the weapon system's accuracy and reliability.

Officials say the original mid-April flight plan was delayed to avoid it being misconstrued by North Korea during a time of heightened tensions. It was rescheduled for Tuesday morning but was pushed back a day due to a problem with range safety instruments.

St. Louis is well-represented on the most recent Fortune 500 list of the largest companies in the country.

Express Scripts got the highest ranking of the nine area companies at number 24. The company jumped 60 spots after acquiring Medco Health Services in the last year. Some of the other companies on the list from the area, Emerson, Monsanto, and Ameren.

The top company in the country this year was Wal-mart. 

Here are the St. Louis companies that made the list:

24. Express Scripts Holding

123. Emerson

206. Monsanto

275. Reinsurance Group of America

303. Centene

315. Peabody Energy

373. Ameren

465. Graybar Electric

491. Jones Financial