10-21 and devotion to duty. All warrant officers are commissioned as W-2s. Chief warrant officers wear collar devices or sleeve insignia symbolic of their specialty in the same manner as staff corps officers, as shown in figures 10-16 and 10-17. SPECIAL INSIGNIA Special insignia are worn on the breast to indi- cate  special  qualifications  or  designations  (figs. 10-18  and  10-19).  (NOTE:  Not  all  insignias  are shown.)  Some  examples  of  special  insignia  are  as follows: Student Notes: PAY GRADE NAVY MARINES ARMY AIR FORCE BMRF1013 ENSIGN LIEUTENANT JUNIOR GRADE LIEUTENANT LIEUTENANT COMMANDER COMMANDER CAPTAIN GOLD GOLD GOLD GOLD GOLD GOLD GOLD GOLD SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SILVER SECOND LIEUTENANT SECOND LIEUTENANT SECOND LIEUTENANT FIRST LIEUTENANT FIRST LIEUTENANT FIRST LIEUTENANT CAPTAIN CAPTAIN CAPTAIN MAJOR MAJOR MAJOR LIEUTENANT COLONEL LIEUTENANT COLONEL LIEUTENANT COLONEL COLONEL COLONEL COLONEL 0-1 0-2 0-3 0-4 0-5 0-6 COMMISSIONED Figure 10-13.—Rank insignia of commissioned officers of the U. S. armed services.