The parade, which was put on to celebrate the Army’s 250th anniversary and Trump’s 79th birthday, was reported to cost up to $45 million and drew thinner crowds than anticipated, as simultaneous “No Kings” protests took place in all 50 states.

As millions of Americans protested at “No Kings” rallies across the country, onlookers gathered in Washington on the president’s birthday for a muted celebration.

Palantir, the data analysis and technology firm whose contracts with the federal government are expanding, and Coinbase, a cryptocurrency firm that donated to the president’s inauguration, also sponsored the event. Oracle, a database company whose co-founder is a close friend of Mr. Trump’s, received a shout-out on Saturday as a sponsor.