The US Army has defended an Arlington National Cemetery employee who was pushed aside during a visit by former president Donald Trump, saying that she acted professionally and was being unfairly attacked.

The military rarely comments on political matters and while its statement on Thursday (local time) did not explicitly mention Trump or his 2024 presidential campaign, it referred to a ceremony last Monday.

On that day Trump, the Republican candidate in the November 5 US presidential election, visited the Washington DC cemetery for a wreath-laying ceremony honouring 13 service members killed during the chaotic US withdrawal from Afghanistan in 2021.

He also visited Section 60 of the cemetery, where troops are buried and which is considered hallowed ground in the military.

Federal law and Pentagon policies do not allow political activities in Section 60. Despite that, videos were taken by Trump’s campaign and have since been used in advertisements.

“An ANC (Arlington National Cemetery) employee who attempted to ensure adherence to these rules was abruptly pushed aside,” the Army statement said.

“This incident was unfortunate, and it is also unfortunate that the ANC employee and her professionalism has been unfairly attacked.”

In a speech in Michigan on Thursday, Trump said families of service members who died in Afghanistan had asked him to go to Arlington and take photographs with them.

“They love me and I love them,” he said.

Trump campaign spokesperson Steven Cheung had said: “The fact is that a private photographer was permitted on the premises and for whatever reason an unnamed individual, clearly suffering from a mental health episode, decided to physically block members of President Trump’s team during a very solemn ceremony.”

Trump’s running mate JD Vance, a former Marine, has accused the Harris campaign of “trying to make a massive political issue” of the incident.

Trump used the third anniversary on Monday of the US withdrawal from Afghanistan to try to pin the chaotic pullout on his Democratic rival for the White House, Kamala Harris.

The US military is meant to be apolitical, loyal to the US Constitution and independent of any party or political movement.

The Arlington cemetery incident has revived fears among some officials and experts that Trump could use the military for political purposes if he wins a second term.

While in office, Trump intervened and restored the rank of a Navy SEAL convicted of posing with the corpse of an Islamic State detainee and threatened to use US troops to put down protests around the country.

Since leaving office Trump has berated some military officials.

“We really did not want to get involved in this,” said a US military official, speaking on condition of anonymity.

“But what happened [at Arlington] is not acceptable.”

The Army has said that it considers the matter closed since the employee did not press charges.

Whether the incident will sway veterans on election day is unclear.

In a report published in April, the Pew Research Centre found that military veterans favoured the Republican Party, with 63 per cent of respondents identifying with or leaning Republican.

-with AAP