Commodore is a senior naval rank used in many navies which is equivalent to brigadier and air commodore. It is superior to a navy captain, but below a rear admiral. It is either regarded as the most junior of the flag officers rank or may not hold the jurisdiction of a flag officer at all depending on the officer's appointment. Non-English-speaking nations commonly use the rank of flotilla admiral, counter admiral, or senior captain as an equivalent, although counter admiral may also correspond to rear admiral lower half abbreviated as RDML.
Colonel is a senior military officer rank used in many countries. It is also used in some police forces and paramilitary organizations.
Brigadier is a military rank, the seniority of which depends on the country. In some countries, it is a senior rank above colonel, equivalent to a brigadier general or commodore, typically commanding a brigade of several thousand soldiers. In other countries, it is a non-commissioned rank.
An aide-de-camp is a personal assistant or secretary to a person of high rank, usually a senior military, police or government officer, or to a member of a royal family or a head of state.
Sergeant major is a senior non-commissioned rank or appointment in many militaries around the world.
Colonel commandant is a military title used in the armed forces of some English-speaking countries. The title, not a substantive military rank, could denote a senior colonel with authority over fellow colonels. Today, the holder often has an honorary role outside the executive military structure, such as advocacy for the troops.
The Sri Lanka Army is the oldest and largest of the Sri Lanka Armed Forces. Established as the Ceylon Army in 1949, it was renamed when Sri Lanka became a republic in 1972. In 2010, the Army had approximately 200,000 regular personnel, between 20,000 and 40,000 reserve (volunteer) personnel and 18,000 National Guardsmen and comprises 13 divisions, one air-mobile brigade, one commando brigade, one special forces brigade, one independent armored brigade, three mechanized infantry brigades and over 40 infantry brigades.
Gorget patches are an insignia in the form of paired patches of cloth or metal on the collar of a uniform (gorget), used in the military and civil service in some countries. Collar tabs sign the military rank, the rank of civil service, the military unit, the office (department) or the branch of the armed forces and the arm of service.
The following tables present the ranks and insignia of the Sri Lanka Navy. These ranks are similar to Royal Naval officer ranks and the ratings ranks. Sri Lanka does have an Admiral rank, but it is usually only awarded to the Chief of Defence Staff (CDS) or as an honorary rank; Admiral Wasantha Karannagoda was the only Sri Lankan naval officer to hold a full admiral rank while in active service.
The Sri Lanka Artillery (SLA) is the artillery arm of the Sri Lanka Army. It is made up of ten regular regiments and two volunteer regiments. The SLA is headquartered at Panagoda Cantonment, Panagoda.
The Gemunu Watch (GW) ("King Dutugemunu's Own") is a infantry regiment of the Sri Lanka Army, formed with troops from the Ceylon Light Infantry and the Ceylon Sinha Regiment in 1962. It has been deployed in many major operations against the LTTE. It is made up of 14 regular units and 9 volunteer units. Headquartered at Kuruwita Army Camp, Ratnapura. It is named after one of the most famous Lankan Kings, King Dutugemunu.
The Sri Lanka Army Volunteer Force (SLAVF) is the active-duty volunteer reserve force of the Sri Lanka Army. The SLAVF is separate from the Regular Force which consists of personal who are professional soldiers and its Regular Reserve, which comprises personal who have a mobilization obligation following their service in the regular army. The SLAVF consists of the volunteer force and the volunteer reserve; administration and recruitment of reserve personal is carried out by the Volunteer Force Headquarters in Shalawa, Kosgama which is headed by the Commandant of the Volunteer Force. It has a current strength of about 55,000 personnel. The SLAVF was known as the Ceylon Volunteer Force from 1949 to 1972 and the Sri Lanka Volunteer Force from 1972 to 1985.
The Sri Lanka Military Academy, commonly known simply as Diyatalawa, is the Sri Lanka Army's training centre where officer cadets are trained for getting commission. It is located in the garrison town of Diyatalawa in the central highlands of Sri Lanka. All Sri Lanka Army officer cadets, including army cadets of the General Sir John Kotelawala Defence University, are trained at SLMA. Although not a university, SLMA is affiliated to the General Sir John Kotelawala Defence University to provide its cadets of regular long course a degree in military studies.
General Tissa Indraka Weeratunga, VSV was a Sri Lankan general. He was the former Commander of the Sri Lankan Army and the first General Officer Commanding (GOC) of the Joint Operations Headquarters (JOH), he was later Sri Lanka's High Commissioner to Canada.
General Ganegoda Appuhamelage Don Granville Nalin Seneviratne, VSV was a Sri Lankan Army general. He was the Commander of the Sri Lankan Army from 1985 to 1988 and first Governor of the North East Province.
Major is a junior officer rank in the Sri Lanka Army. The rank insignia for a major is the Sri Lankan emblem. It ranks below lieutenant colonel and above captain. The equivalent is Lieutenant-Commander in the Sri Lanka Navy and Squadron Leader in the Sri Lanka Air Force.
Major General is a senior rank in the Sri Lanka Army, and was created as a direct equivalent of the British military rank of major general. It is the second-highest active rank of the Sri Lanka Army while the Lieutenant General is the highest, and is considered to be equivalent to a two-star rank. A major general commands a division or the equivalent or performs staff duties in army headquarters.
Brigadier (Brig) is a senior rank in the Sri Lanka Army. Brigadier is a superior rank to Colonel, but inferior to Major-General. The rank has a NATO rank code of OF-6, equivalent to Commodore in the Sri Lanka Navy and Air Commodore in the Sri Lanka Air Force. It corresponds to the rank of brigadier general in many other nations. In the Sri Lanka Army, brigadier is the highest field officer rank, whereas brigadier-general is the lowest "general" rank in many armies. However, the two ranks are considered equal.
General Hamilton Wanasinghe, VSV was a General in the Sri Lanka Army. He served as the 11th Commander of the Sri Lankan Army (1988–1991), third General Officer Commanding (GOC) of the Joint Operations Headquarters (JOH) (1991–1993) and Defense Secretary.
Lieutenant colonel, is an officer rank in the Sri Lanka Army. The rank is superior to major, and subordinate to colonel. The equivalent Sri Lanka Navy rank is commander, and the comparable rank in the Sri Lanka Air Force is wing commander.
Sri Lanka 
Sri Lanka Army 
Sri Lanka Navy – Captain 
Sri Lanka Air Force – Group Captain 