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.
The Army said it is aware of the photograph and footage and is “investigating the circumstances surrounding this”.
A spokeswoman said: “Far right ideology is completely at odds with the values and ethos of the Armed Forces.
“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.