A man from Salford who scrawled "Lee Rigby's killers should hang" on the RAF Bomber Command War Memorial was jailed for 12 weeks today.
Daniel Smith, 21, received consecutive six-week sentences for two counts of criminal damage, an official at Westminster Magistrates' Court said.
Smith from Grecian Street North was told at an earlier hearing that he faced a minimum suspended jail sentence.
District Judge Quentin Purdy told him: "There are those who are deeply offended by what you chose to do and may wish you considerable ill, I am sure, simply because you chose to do it."
The court heard that Smith admitted writing "Lee Rigby's killers should hang" on the memorial in central London on June 5. He said he did not realise it was a war memorial.
His defence counsel, Colleen Gildernew, told an earlier hearing that Smith was "disgusted with himself" for the act.
He had also daubed "EDL" and "F**** the police" on the memorial in Green Park.
Damage to the memorial, created to remember the thousands of RAF crew who lost their lives in the Second World War, amounted to £870.
The memorial was vandalised twice in just over a week following the murder of Fusilier Rigby in Woolwich, south east London, on May 22.
Smith also pleaded guilty at an earlier hearing to causing £510 of criminal damage to a wall of a commercial property in Knightsbridge.
Smith has 44 previous convictions, related mainly to shoplifting, the court was told.