The In & Out (Naval and Military Club) | 1,584 followers on LinkedIn. A Sanctuary Nestled In The Heart of London | Welcome to the Naval and Military Club – otherwise known as the In and Out, a nickname that originated from the carriage gates at our old clubhouse at 94 Piccadilly and which we have carried forward to our magnificent clubhouse at No 4 St James's Square. We are universally known across clubland as the In and Out and proud of it too! The grandeur of the Grade II* listed, the In & Out (Naval and Military Club) is the perfect setting for your social or corporate events and is available for private hire for members and non-members.