Lewes's invention of the Lewes Bomb and his expertise in demolition techniques significantly shaped the SAS's focus on destroying enemy infrastructure, particularly aircraft on the ground.

Lewes played a key role in training SAS recruits in the use of explosives and sabotage techniques. His knowledge and skills ensured that the SAS had the expertise to carry out effective raids behind enemy lines.

Lewes's emphasis on unconventional warfare and the use of specialized weapons continues to influence special forces tactics worldwide. His contributions helped establish the SAS as a pioneer in modern special operations.