Hundreds of thousands of people inside Ukraine were cut off from life-saving aid due to the military encirclement of cities, a U.N. report said on March 7, calling urgently for safe passage.

The U.S. military said on March 2 it is no longer requiring masks indoors at the Pentagon after new COVID-19 guidance from the Centers for Disease Control and Prevention.

President Joe Biden on January 13 said he will deploy more military health workers to six U.S. states beginning next week, and give Americans free masks and more free tests to tackle the fast-spreading Omicron variant around the country.

Raytheon Technologies’ top boss warned on Oct. 26 that the U.S. aerospace and defense firm will lose ‘several thousand’ employees who refused to take Covid-19 vaccines, as the company prepares to meet the Biden administration’s Dec. 8 deadline for immunization.

Members of the U.S. military who were vaccinated against Covid-19 showed higher-than-expected rates of heart inflammation, although the condition was still extremely rare, according to a study released on June 29.

U.S. distribution of Moderna Inc’s Covid-19 vaccine began on Dec. 19, with more than 3,700 sites due to start receiving and administering shots as soon as Dec. 21, vastly widening the rollout started by Pfizer Inc.

U.S. coronavirus deaths soared to a daily record of 3,580 and hospitalizations rose for the 19th straight day on Dec. 16, ramping up the stakes as regulators on Dec. 17 considered whether to approve a second Covid-19 vaccine.

Pfizer, COVID vaccine

The first days of Pfizer Inc.’s Covid-19 vaccine rollout have seen unexpected hitches including some vaccines being stored at excessively cold temperatures and Pfizer reporting potential challenges in vaccine production, U.S. officials said.

The United States hit a record 16 million Covid-19 cases on Dec. 12, with deaths closing in on the 300,000 mark, as millions of doses of a new vaccine were expected to start rolling out across the nation on Dec. 13.

U.S. President Donald Trump said the United States plans to accelerate the development of a coronavirus vaccine, an effort that has been dubbed “Operation Warp Speed.”