Venezuela???s self-proclaimed interim president Juan Guiado greets the crowd after climbing onstage, during an event to swear in nurses, doctors, professionals and others, as the group that will help with the arrival and distribution of humanitarian aid in Venezuela, in Caracas, Venezuela, Saturday, Feb. 16, 2019. The U.S. Air Force has begun flying tons of aid to a Colombian town on the Venezuelan border as part of an effort meant to undermine socialist President Nicolas Maduro. The first of three C-17 cargo planes has flown from Homestead Air Reserve Base in Florida and landed in the town of Cucuta. (AP Photo/Ariana Cubillos), APTOPIX