This is not the image Army officials had wanted.

While tanks, armored troop carriers and artillery systems pour into Washington for the Army’s 250th birthday celebration, National Guard troops from the Army’s 79th Infantry Brigade Combat Team, supplemented by active-duty Marines, have been deployed to the streets of Los Angeles.

It is a juxtaposition that has military officials and experts concerned.

Several current and former Army officials said the military parade and other festivities on Saturday — which is also President Trump’s 79th birthday — could make it appear as if the military is celebrating a crackdown on Americans.

“The unfortunate coincidence of the parade and federalizing the California National Guard will feel ominous,” said Kori Schake, a former defense official in the George W. Bush administration who directs foreign and defense policy studies at the American Enterprise Institute.

Dr. Schake initially did not consider the parade much of a problem but is now concerned about “the rapid escalation by the administration” in Los Angeles.

The two scenes combined “erode trust in the military at a time when the military should be a symbol of national unity,” said Max Rose, a former Democratic congressman and an Army veteran.

“They are deploying the National Guard in direct contradiction to what state and local authorities requested, and at the same time there’s this massive parade with a display more fitting for Russia and North Korea,” he said.