Category:Ships with pennant number 21

B

• [×] USS Block Island (CVE-21)‎ (2 F)
• [+] USS Boxer (CV-21)‎ (1 C, 19 F)

C

• [×] USS Cochrane (DDG-21)‎ (4 F)

E

• [×] USNS Effective (T-AGOS-21)‎ (4 F)

F

• [×] USS Flatley (FFG-21)‎ (1 F)

G

• [×] HMS Glasgow (C21)‎ (5 F)
• [×] HMS Göteborg (K21)‎ (2 F)

G cont.

• [×] USS Gridley (CG-21)‎ (4 F)

K

• [×] USS Kansas (BB-21)‎ (16 F)
• [×] ARA King (P-21)‎ (1 F)

L

• [×] LST-21 (ship, 1943)‎ (2 F)

M

• [×] HMCS Magnifcent (CVL 21)‎ (9 F)
• [×] ARV Mariscal Sucre (F-21)‎ (6 F)
• [×] HMAS Melbourne (R21)‎ (41 F)

M cont.

• [×] USNS Mercury (T-AGM-21)‎ (2 F)
• [×] USS Milwaukee (C-21)‎ (7 F)

N

• [+] USS New York (LPD-21)‎ (4 C, 61 F)

S

• [×] USS Seawolf (SSN-21)‎ (23 F)
• [×] HMS Södermanland (J21)‎ (7 F)