Normally, they are equipped with thermal insulation, ventilation, and a sprinkling system. They are securely locked. Certain magazines located within the armor box of aircraft carriers and used for stowage of completely assembled rounds of weapons and deployable targets are also ready-service magazines. Lockers Certain   compartments   or   lockers   are   used   to stow   special   types   of   ammunition   and   ammunition components,   such   as   detonators,   pyrotechnics,   and chemicals. They are frequently located on the weather deck. They are located as conveniently to the weapon or space   to   be   served   as   possible.   They   may   not   be equipped  with  sprinklers,  but  they  do  have  locking devices. Special flare ready-service lockers are located at outboard locations on aircraft carriers for short-term stowage of aircraft parachute flares. These flares have either  been  removed  from  the  primary  pyrotechnics magazines or prepared for launching or they have been returned   intact   after   a   mission.   If   necessary,   these lockers are manually jettisoned. A label is installed on the  locker  identifying  the  type  of  explosives  that  are stowed    within    each    locker.    Where    stowage    for ammunition is provided by lockers, chests, or racks that are  permanently  secured  to  the  ship's  structure,  don't change    their    location    without    prior    approval    of NAVSEASYSCOM. Chemical Magazines Chemical    ammunition    classified    as    lethal    or incapacitating isn't carried aboard ships unless specifically    authorized    by    NAVSEASYSCOM    or higher    authority.    If    authorized,    specific    stowage instructions   are   issued   by   NAVSEASYSCOM,   and personnel involved in handling procedures must receive appropriate  training.  Specific  spaces  aboard  ship  may be designated as chemical magazines by NAVSEASYSCOM.  The  decks  and  bulkheads  of  a chemical  magazine  are  coated  with  an  impermeable material,  and  the  magazine  contains  a  provision  for sampling   its   internal   atmosphere   from   an   adjacent compartment.    Facilities    for    personnel    and    gross decontamination are located near the magazine. IMPROVED REARMING RATE PROGRAM Modern    naval    aircraft    carriers    incorporate    a magazine  stowage  concept  called  "modular  stowage." The modular stowage concept gives greater versatility in   magazine   stowage   arrangement   and   minimizes ammunition   handling.   It   makes   it   easier   to   stow ammunition, such as bombs and missiles, as fleet issue loads.  Also,  it  isn't  necessary  to  depalletize  or  decan loads  before  they  are  stowed.  The  incorporation  of modular  stowage  and  the  addition  of  larger  weapons elevators   to   service   these   areas   brought   about   the Improved Rearming Rate Program (IRRP). The IRRP allows major handling time improvements  in  two  areas—rearming  and  weapons assembly.  Stowing  ammunition  as  received  on  pallets lets handling crews rearm the ship's mission load in less time  than  the  old  system.  In  turn,  handling  time  is minimized during weapons assembly. DESIGNATION OF MAGAZINES Magazines    or    ammunition    spaces    afloat    are designated  with  particular  reference  to  the  purpose intended. Generally, magazines aboard ship are designated to hold a single type of ammunition. Single-Purpose Magazine Magazines are designated as single-purpose stowage magazines whenever practical. The following are single-purpose magazine designations: powder and rocket    motor    magazine;    hypergolic    rocket    motor magazine;   fixed   ammunition   magazine;   small   arms magazine;    missile    magazine;    warhead    locker    or magazine;   aircraft   bomb   magazine;   projectile   and rocket    head    magazine;    fuze    magazine;    detonator locker; pyrotechnic magazine or locker; ready-service ammunition  room,  box,  rack,  or  locker;  and  chemical magazine. Multipurpose Magazine While stowage of a single type of ammunition in an individual    magazine    is    desirable,    it    isn't    always possible. NAVSEASYSCOM authorizes certain mixed stowage   in   magazines   that   retain   a   single-purpose designation.  Where  stowage  space  is  limited  and  the mission requires carrying various types of ammunition, stowage  of  more  than  one  type  of  ammunition  in  a magazine  is  an  acceptable  hazard.  Authorization  for this   type   of   stowage   is   at   the   discretion   of   the operational commander. AMMUNITION STOWAGE REQUIREMENTS Generally,  there  are  magazines  for  each  type  of ammunition stowed aboard ship. Ammunition, explosives,  and  explosive  components  are  stowed  in 11-10