Instruct: Classify Amazon reviews into positive or negative sentiment
Query: balls to the wall

The book 'get tough' truly has balls to the walls techniques - direct and brutal. However, readers should note that this is not the complete hand to hand combat manual that this gentleman published. Some techniques and procedures are actually missing from this "compilation."Secondly, although the techniques are direct and brutal they are limited only to techniques that are executed (1) with combat uniforms (fatigues, boots etc.), (2) standing upright and (3) against one opponent always. In the today's world these techniques may have their shortfalls.The book is good for reference purpose (history maybe) and is not the be all and end all of hand to hand fighting.