Lance corporal Powell and the team are currently in training on the Dartmouth coast and are taking part in a series of trials at sea to perfect their rowing technique and familiarize themselves with the boat.
Team leader Lieutenant Mike Cataldo said: "To date, only 141 people have rowed the Atlantic so this really is the ultimate test of courage, determination and team work."
The soldiers hope to complete the challenge in 50 days and expect to arrive in the UK at the end of July.