The U.S. goal of getting initial COVID-19 vaccine doses to 20 million Americans by year’s end was looking like a long shot Tuesday. The Trump administration’s Operation Warp Speed initially promised to unleash a vast stockpile of 300 million vaccine doses by January but later slashed its target and said it hoped to get about 40 million doses to recipients by the end of the year. But with just three days left in the year, the CDC reported Tuesday that only 11.45 million doses had been distributed since Dec. 13 with only about 2.1 million doses actually administered. “We certainly are not at the...