On 31 March, United States Secretary of State Mike Pompeo said that sanctions did not apply to humanitarian aid during the health emergency and that the United States would lift its sanctions if Maduro agreed to organize elections that did not include Maduro in a period of six to twelve months and reiterated U.S. support for Guaidó. Then on 1 April President Trump announced that he was sending anti-drug Navy ships and AWACS planes to the region near Venezuela in one of the largest military build-ups in the region since the 1989 invasion of Panama to remove General Manuel Noriega from power. Despite the continually strained ties between the two governments, 82% of Venezuelans viewed the U.S. positively in 2002, though this view declined down to 62% in 2014 (per the Pew Research Global Attitudes Project). The Gallup Global Leadership Report indicates that as of 2013, 35% of Venezuelans approve of United States' global leadership, and 35% disapprove. The Spring 2017 Global Attitudes Survey by Pew Research Center found that 35% of the Venezuelan population views the United States unfavorable and 47% view it favorably." In 1960, the UNITAS naval exercises and in-port training involving several countries in North, South and Central America were conducted for the first time in Venezuelan territorial waters in support of the Cold War U.S. policy. Venezuela is an active member of SICOFAA. Denver Mint  The Denver Mint is a branch of the United States Mint that struck its first coins on February 1, 1906. The mint is still operating and producing coins for circulation, as well as mint sets and commemorative coins. Coins produced at the Denver Mint bear a D mint mark (not to be confused with the mark of the Dahlonega Mint). The Denver Mint is the single largest producer of coins in the world. The predecessors of the Denver Mint were the men of Clark, Gruber and Company. During the Pikes Peak Gold Rush, they coined gold dust brought from the gold fields by the miners. In 1858, Austin M. Clark, Milton E. Clark and Emanuel Henry Gruber founded a brokerage firm in Leavenworth, Kansas, and then established an office in Denver at the beginning of the Colorado Gold Rush. Desiring to save on shipping and insurance costs associated with shipping gold back east, the firm opened a private mint. On 25 July 1860, the mint opened in a two-story brick building on the corner of Market and 16th Streets, minting $10 gold pieces at the rate of "fifteen or twenty coins a minute".