The Bulgarian Navy (Bulgarian: Военноморски сили на Република България, romanized: Voennomorski sili na Republika Balgariya, lit. 'Naval Forces of the Republic of Bulgaria') is the navy of the Republic of Bulgaria and forms part of the Bulgarian Armed Forces. It has been largely overlooked in the reforms that Bulgaria had to go through in order to comply with NATO standards, mostly because of the great expense involved and the fact that naval assaults are not considered to be a great concern for the country's security. That is why three of the four Romeo-class submarines (excluding Slava) are now docked and have been out of operation for some time. The last one was decommissioned in November 2011. Only the more modern frigates, corvettes and missile crafts are on active duty.