KAPOLEI, Hawaii -- Waves, wind and darkness hampered the ocean search off Hawaii for a Chinese man reported missing while attempting to set a sailing record, the U.S. Coast Guard pilot who was the missions air commander said Thursday.It was pretty frustrating not to find him, not to hear him, Lt. Ben Powers said at Air Station Barbers Point in west Oahu, the morning after the Coast Guard called off its search for Guo Chuan. The hardest thing we do is search for a person in the water because its a huge ocean.Chuan, 50, was attempting to set a sailing record from San Francisco to Shanghai. The search was suspended after a U.S. Navy crew from the USS Makin Island went aboard Guos 97-foot trimaran about 620 miles northwest of Oahu and found only his life jacket.As one of the pilots of one of the HC-130 Hercules planes that participated in the search, Powers spent hours scanning the ocean for Guo through 4-to-6-foot waves. There was no moon, he said, so illumination was low even with night-vision goggles.Rescuers radioed Guo every 15 to 30 minutes, Powers said. There was no response.When the persons in the water basically the only thing above the water is the persons head, Powers said. So thats really what were looking for -- something the size of a human head from an aircraft from 300 to 700 feet.Because Guos boat was well-tracked, rescuers had a good idea where he fell into the water, Powers said.Guo was a professional mariner with a deep passion for sailing. Our thanks to our Navy partners who helped us search for this vessel in a timely manner so far from shore in an attempt to locate Mr. (Guo) Chuan. Our deepest condolences go out not only to his family and friends but also to his racing team and the sailing community, said Capt. Robert Hendrickson, who directed the Coast Guards search.Guos sailboat, the Qingdao China, is adrift, and its main sail has been taken down, the Coast Guard said. The Coast Guard says it broadcast a warning to mariners to beware of the drifting boat.Guos racing team plans to recover the sailboat, the Coast Guard said.Guo was the first Chinese person to sail around the world in 2013, according to his website, guochuanracing.com.Guo left San Francisco on Oct. 18 to challenge the solo nonstop trans-Pacific world record. The current speed record for that journey is 21 days, and he was trying to sail from San Francisco to Shanghai within 20 days, the website says.In Beijing, the Foreign Ministry said on Thursday that Chinas consulate general in Los Angeles had alerted the U.S. Coast Guard in Hawaii when it learned that Guo could not be reached. Spokesman Lu Kang said Chinese diplomats had helped in the coordination of the search and continued to monitor the situation.---Follow Jennifer Sinco Kelleher at http://www.twitter.com/JenHapa. Her work can be found at http://bigstory.ap.org/content/jennifer-sinco-kelleherNike Air Presto Deutschland Kaufen . 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"Jeff is a hard worker who was an important special-teams contributor for us last season," said Stamps GM John Hufnagel.Kazakhstan says five of its athletes have failed retests from the 2008 and 2012 Olympic Games.The athletes were not named and it was not immediately clear in which events they competed.The Central Asian nation has faced repeated doping scandals in recent years, particularly in weightlifting and cycling.The IOC is retesting samples from the Beijing and London Olympics to catch cheats who might be competing this year in Rio de Janeiro. So far, 55 positives have been recorded - 32 from Beijing and 23 from London.Separately, the Russian Olympic Committee says two of its athletes B samples came back negative.They are race walker Denis Nizhegorodov and rower Alexander Kornilov. Athletes must provide 90ml of urine or a blood sample. If there are adverse analytical findings in the B sample as well as the A the athletee will be banned for violating anti-doping regulation.ddddddddddddB samples are not more important than A samples, but they confirm findings in the first analysis. If the analysis of the B sample does not confirm the findings in the A sample, the athlete is cleared to compete.WADA Director General David Howman said: The B sample helps confirm that an anti-doping rule violation has occurred and protects the rights of the athletes.It should be stressed that anti-doping is one of the few types of controls in society in which a confirmation procedure is used in order to protect individuals, and the very rare cases in which the analysis of the B-sample did not match the results of the A-sample have shown the usefulness of such procedure.Also See:23 fail London 2012 retestsCoe: 2012 not dirtiest GamesEight Russians fail retestsRussia seeks Rio compromise ' ' '