An ailing tugboat captain was medevaced in Brownsville, Texas, Thursday, the U.S. Coast Guard said.Watchstanders at Coast Guard Sector/Air Station Corpus Christi command center received a medevac request at 7:16 a.m. via VHF Channel 16 from the crew of the El Zorro Grande, a tugboat transiting outbound on the Brownsville ship channel, stating the captain had passed out, officials said.