I'll quote the answer and a lil more to show how stupid a move it was to them to remove the masks:
The vice president’s office declined to tell The Intercept who the woman was, but Brianne Pfannenstiel of the Register
reported later that a Trump administration official said the woman was “an advance staffer,” who had been dispatched from Washington to manage set-up for the event.
Two of those executives, Ken Sullivan of Smithfield Foods and Noel White of
Tyson Foods, run meatpacking plants where hundreds of workers have contracted Covid-19, including a Tyson plant in Waterloo, Iowa where more than a third of the workforce — 1,031 people — has tested positive and at least three workers have died. The Tyson plant in Waterloo was reopened on Thursday following an executive order from President Donald Trump that designated the meat supply “critical infrastructure.”
The strange request to the executives to remove their masks underscored just how committed the White House is to ignoring
federal health advice intended to slow the spread of the pandemic coronavirus.
Although the vice president appeared to follow social distancing guidelines during the discussion, he did not wear a mask, nor did any of the officials who accompanied him on Air Force Two from Washington: Agriculture Secretary Sonny Perdue and Iowa’s two Republican senators, Chuck Grassley and Joni Ernst. The Des Moines Register
reported that, before the event, “staffers with gloves and masks took the temperatures of people who entered the building one at a time.” Video of the hall
showed that very few of the people in the audience were wearing masks.
Unmasked in Iowa: CEOs Who Came to Meet Pence in Masks Were Asked to Remove Them
