Captain Jennings died after the vehicle he was travelling in struck an explosive device while on an operation to the south of Kabul.
Squadron Leader Anthony Downing RAF, whose death was announced separately by the Ministry of Defence, was travelling in the same vehicle.
Captain Tom Jennings
Captain Jennings, aged 29, was a true leader, selfless in his professional approach serving those who were his responsibility. Dedicated and humble, he was an archetypal Royal Marine with a keen sense of humour even when faced with adversity. While working with the Afghan forces that he partnered, he displayed empathy and a broad cultural understanding that ensured he was highly valued by the Afghans as well as his Royal Marine brothers.
He was devoted to his wife and their two young sons whose loss cannot be portrayed in words. The Royal Marines have lost a brother, they have lost their world.
Capt Jennings family have asked that their privacy is respected.