The Army is investigating after far-right activist Tommy Robinson posted a photograph of himself surrounded by soldiers.
The former English Defence League (EDL) leader, 35, shared a picture of himself posing with a group of grinning young men in camouflage uniform.
He also posted a video of himself on Monday with a crowd of Army personnel who started cheering and shouting his name.
"A moment like this makes it all worth while. Today I met real British heroes (SIC)," he wrote in the Facebook post.
An Army spokesperson said: “We are aware of a photograph and video of a group of Army personnel on social media and are investigating the circumstances surrounding this.
Tommy Robinson posted this photo on his Instagram page
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"Anyone who is in breach of the Army’s values and standards will face administrative action.”
They added that: "The Armed Forces have robust measures in place to ensure those exhibiting extremist views are neither tolerated nor permitted to serve."
Imam Asim Hafiz, Islamic religious advisor to the Armed Forces, said that "any form of racism, discrimination or extremism is taken extremely seriously and will be dealt with accordingly".
"The Armed Forces remain absolutely committed to welcoming individuals from across all faiths and cultures into its ranks," he added.
The young soliders look happy to pose for pictures with Robinson
Tommy Robinson founded the far right English Defence League
When news of the investigation emerged Robins, real name Stephen Yaxley-Lennon, wrote on his Instagram page: "Watch the backlash if the army attempt to discipline these young recruits for expressing one of their very freedoms they are expected to fight & die for".
The Muslim Council of Britain said Mr Robinson "does not represent our Armed Forces, however much he tries to claim otherwise".
"He will rile against the very real steps taken to make the military more diverse," a spokesman added.
"He will remain silent on the sacrifices Muslims and others made in the two World Wars.
"We welcome the swift statement by the Army in disassociating itself from the far-right and we hope that safeguards are put in place to ensure that Islamophobia will have no place in our armed forces."