He first saw action during the
1971 JVP Insurrection as Lieutenant and was promoted to
captain in 1973. He was promoted to Major in 1977, Lieutenant Colonel in 1986 and Colonel in 1988; serving as the Commanding Officer, 5 Field Engineer Regiment; Chief Instructor,
Sri Lanka Military Academy and Military Liaison Officer, Ministry of Defence.
Second JVP insurrection As a Colonel, Janaka Perera took a significant role in suppressing the
1987–1989 JVP insurrection. He was the Provincial Commander of the North-Western Province He was promoted to
brigadier in 1989.
Operation Riviresa A few months later in late 1995, Brigadier Perera played a major role during
Operation Riviresa which led to the liberation of the
Jaffna Peninsula, during which he commanded the elite
53 Division which consisted of the Independent Brigade, Air Mobile Brigade, Armored Brigade and an Infantry Brigade.
Higher command In 1996, he was promoted to the rank of
major general. He served as
General Officer Commanding of the 53 Division,
51 Division,
23 Division. Later he was promoted to the post of Deputy Chief of Staff and functioned as Commandant,
Sri Lanka Army Command and Staff College. During this time there were fears in Colombo that the 40,000 troops in the Jaffna peninsula would be cut off, trapped, and overrun. President
Chandrika Bandaranaike Kumaratunga negotiated with the Indian government for ships to evacuate troops from the peninsula due to the lack of transport ships in the Navy. However, the Indian government refused to provide ships. Launching several effective counter-offensives that halted the
LTTE advance, removing the threat to the Jaffna peninsula and succeeded in established the defence line in the Jaffna peninsula, which remained in place till the last days of the war. He had the unique distinction of being the
colonel commandant of the
Commando Regiment,
Special Forces Regiment and the
Corps of Sri Lanka Engineers.
Decorations Major General Janaka Perera had been awarded the gallantry medals
Rana Wickrama Padakkama and
Rana Sura Padakkama, the distinguished service medal the
Vishista Seva Vibhushanaya, long service medals
Uttama Seva Padakkama,
Sri Lanka Armed Services Long Service Medal, foreign service medal
Videsha Seva Padakkama, combat service medals
Purna Bhumi Padakkama,
North and East Operations Medal the campaign medals
Vadamarachchi Operation Medal and the
Riviresa Campaign Services Medal and also the
Republic of Sri Lanka Armed Services Medal, 50th Independence Anniversary Medal 1998, Sri Lanka Army 50th Anniversary Medal and
President's Inauguration Medal. ==Diplomatic career==