Ask the BBC's defence correspondent

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The BBC's defence correspondent, Jonathan Marcus, has extensive experience on reporting from the front line.

He has covered stories for the BBC from the Gulf, the Middle East, the Balkans and Eastern Europe.

Jonathan was live on the air as the terrorist attacks of 11 September unfolded, and says the subsequent war on terrorism was one of the hardest stories he's ever had to report.

He says the scale of the human tragedy and its global ramifications posed "a fundamental challenge to one's analytical skills and raised basic questions about the role of journalists and journalism."

Jonathan Marcus answered your questions on his experiences in a special forum from Nantucket, USA. He was joined by Lisa Mullins and Quill Lawrence from the BBC / WGBH programme "The World".