At this time of heightened security, Cambridgeshire's RAF bomb disposal team know only constant training will keep them ready for what comes next.
Based at RAF Wittering, technicians from 5131 Squadron are regularly deployed all over the country to diffuse suspicious devices. Much of their work involves wartime weapons like mines, mortars and hand grenades unearthed during archaeological digs. But they are often called to deal with deliberately planted improvised explosive devices.
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The squadron's history dates back to World War Two and its technicians have won a total of 43 bravery awards.
The squadron hasn't lost an officer on active duty for more than 30 years. Today robots are used where possible to keep them safe. No two jobs are the same. Preparation for every one is painstaking. And dealing with a major incident can mean taking the decision to evacuate hundreds, even thousands of people.
Most legacy munitions which are unearthed are dealt with the old fashioned way - an officer getting up close and personal with a bomb.
And there are still dozens of incidents every year along beaches and in fields, woods and gardens so the squadron never knows when the phone will ring next.