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Oscar II Class Submarines
Oscar Parkes
Oscar Peatross
Oscar Underwood
Oscarsborg Fortress
Also: Oscarborg FortressOsce
Oscillating Turrets
Oskar Kummetz
Oskar Stark
Oslo
Oslo Report
Oslyabya
Osman Pasha
Osmaniye
Osmaniye Class Ironclads
Also: Osmaniye ClassOsmond De Brock
Osprey Publishing
Ostar
Ostend
Ostend Raids
Ostergotland Class Destroyers
Ostfriesland
Ostia
Ostmark
Oswald Mosley
Oswald Spengler
Oswin Murray
OTO Melara
OTO Melara 127 mm Gun
Also: OTO Melara 127 mmOTO Melara 127/64
OTO Melara 76 mm
OTO Melara 76 mm Gun
OTOMAT Missiles
France and Italy active radar homing surface-to-surface missile family for anti-ship strikes.
Also: OTOMAT Missile, TESEO/OTOMAT