A man has pleaded guilty to scrawling graffiti about Fusilier Lee Rigby's murder on the RAF Bomber Command War Memorial.
Daniel James Smith, 21, of Grecian Street North, Salford, admitted writing "Lee Rigby's killers should hang" on the memorial in central London on June 5.
Colleen Gildernew, defending, said: "He had no idea that the war memorial was a war memorial.
"He is very disgusted with himself, even more so because of that."
Smith was planning to go to Fusilier Rigby's funeral but was arrested and could not go, Westminster Magistrates' Court heard.
Ms Gildernew said Smith had applied for a job in the British Army but was unsuccessful "because of his convictions as a young boy".
Ms Gildernew said the experiences of Smith's two army friends - one who has lost both legs and another who suffers from memory loss as the result of a bomb - had had an "emotional impact on him".
The damage to the memorial, which was created to remember the thousands of RAF crew who lost their lives in the Second World War, amounted to £870.
Didstrict Judge Quentin Purdy said he was prepared to explore all "reasonable options" for Smith moving on rather than being sent back into custody.
But he said a custodial sentence was a possibility, adding "there may be no alternative".
The court heard Smith had left school at the age of 15 with no qualifications, battled cannabis addiction in his teenage years and struggled with homelessness.
Mr Purdy remanded him in custody and adjourned sentencing until Tuesday November 5 at the same court pending further inquiries into suitable arrangements for him.