The pair, from Plymouth-based Royal Marine 3 Commando Brigade, were among five marines facing court martial.
Plymouth is headquarters of 3 Commando Brigade and Devonport in Plymouth is home to the largest naval base in western Europe.
The British soldiers will include units from 2nd Battalion The Parachute Regiment, 3 Commando Brigade, 16 Air Assault Brigade and 45 Commando Royal Marines.
During a six-month tour of duty, which lasted from April to October last year, seven servicemen from 3 Commando Brigade were killed in action, all from 42 Commando.
Sir Michael said he was giving "very close consideration" to deploying 3 Commando Brigade, currently on exercises in Oman and the UK's specialist winter and mountain warfare troops, inside Afghanistan.
Some 23 servicemen from 3 Commando Brigade lost their lives in 2011 during a summer tour of duty that encompassed the height of the fighting season, while many more were injured.
Said Sareea will start to wind down later this month, but 3 Commando will remain in the area until mid-November as part of an amphibious training exercise in the Arabian Sea.
Altogether, they conducted 41, 000 patrols after taking over command of Task Force Helmand in April that year - the fourth time that 3 Commando Brigade had deployed on Operation Herrick in Afghanistan.
The unit is part of 3 Commando Brigade.
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The families of the Marine, from 40 Commando, and the soldier, from 3 Medical Regiment, have been told.
The preliminary review was looking into the deaths of Cpl David O'Connor, 27, of 40 Commando, and Cpl Channing Day, 25, of 3 Medical Regiment.
What makes the Commando different is its thick black plastic shell, a 3.6-inch touchscreen covered with Corning's extra-tough Gorilla Glass and a micro-USB port sealed with a rubber gasket.
On 24 October, Marine Cpl David O'Connor, of 40 Commando, and Army medic Cpl Channing Day, of 3 Medical Regiment, were shot in Nahr-e Saraj district of Helmand province in a suspected insider attack by an off-duty Afghan policeman.
Cpl Channing Day, 25, of 3 Medical Regiment and Cpl David O'Connor, 27, of 40 Commando, were fatally injured in a gun battle on Wednesday.
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