Military parlance Military parlance is the vernacular used within the military and embraces all aspects of service life ; it can be described as both a " code " and a " classification " of something . Like many close and closed communities , the language used can often be full of jargon and not readily intelligible to outsiders — sometimes this is for military operational or security reasons ; other times it is because of the natural evolution of the day - to - day language used in the various units . For example : " Captain , this situation is ' Scale A " ' ( ' Scale A ' being an army ' s parlance for " This situation requires the closest of attention and resources and all members of relevance should be present . " ) The military has developed its own slang , partly as means of self - identification . This slang is also used to reinforce the ( usually friendly ) interservice rivalries . Some terms are derogatory to varying degrees and many service personnel take some pleasure in the sense of shared hardships which they endure and which is reflected in the slang terms . Military Abbreviations . The military love initials and abbreviations of all kinds - partly for security and operational reasons and partly for the simple convenience of their use ; like all such things they can be hard to understand for outsiders . A few examples are given below : US Army Indian Army British Army Tactics . The " Four Fs " is a military term used in the United States military , especially during World War II . Designed to be easy to remember , the " Four Fs " are as follows : The British Army uses the mnemonic " Perry Rat Likes Shooting Arseholes Regularly " as a way of remembering its Six Section Battle Drills ( Squad Tactics ) : Alternatively , the British Army uses the mnemonic P . R . E . W . A . R . to remember the 6 section battle drills . These are : The 7 P ' s Prior Planning and Preparation Prevents Piss Poor Performance Military Songs & Bands . Many armed forces , particularly the US Army , use songs as part of the training process , to help build morale and allow troops to train to a unified rhythm . Historically armies also went into battle led by a military band and such bands are still maintained in the armed forces today - albeit for mainly ceremonial purposes . Apart from the official side of music , fighting troops have always sung to keep up their morale and to ridicule the enemy , examples from the two world wars include : Ranks . Purpose Military ranks are necessary to identify the role of each serving individual and to show the hierarchy of command ; however they can be obscure to non - military personnel and even comparing comparative ranks between different services is not always straightforward ; the following pages detail these matters in more detail : Insignia Rank insignia is worn on military uniforms to identify the rank of the wearer and can involve such diverse elements as different uniforms , shoulder flashes , armbands and cap insignia . British Army jargon / slang . The British Army has a rich and diverse history of slang usage ; the following links provide more detail on the subject : Medals . Medals are issued to military personnel to commemorate an event , campaign or as a sign of distinction . The history of medals is a subject in itself and more information can be found on the following pages : See the following pages : Code Names . Code Names - such as Operation Market Garden and Operation Overlord are names given by the military to plans being developed and then executed . They serve to disguise the nature of the operation should an enemy or unauthorised person come across the name ( although the military of the United States have recently used codenames to trumpet the operation ' s intention , such as Operation Iraqi Freedom ) .