F-110 class frigate Royal Canadian Navy 15 × River-class Destroyer Otobreda127/54 Compact 5"/54 caliber Mark 45 gun "PROCUREMENT AND MODERNISATION PROGRAMMES
Zumwalt-class destroyers (unusable; no ammunition) Otobreda127/54 Compact and Otobreda127/64: contemporary 127 mm naval gun from Italian manufacturer Oto Melara
(Multirole OTO Munition) PFF: anti-missile projectile, with proximity fuze and tungsten balls embedded in the shell for defined fragmentation effect SAPOM: