The Dijla Operations Command is a special force responsible for protection of Iraqi oil-rich regions from ISIL assaults.
"Today, violent clashes between the joint forces and ISIS elements erupted after ISIS attacked Ajil oil field, located in eastern Tikrit," Lt. Gen. Abdul-Amir Zaidi was quoted as saying by Iraqi News Sunday.
"The clashes resulted in killing 73 ISIS fighters including a number of foreign elements," he added.
At least three servicemen were killed and 13 others were injured during the Sunday clashes with the IS jihadists, Zaidi stated.
Tikrit has been under ISIL control since June 2014. On March 31, Iraqi Prime Minister Haider Abadi declared victory over ISIL militants in the city.
The terrorist group has lost up to 30 percent of its territory in Iraq to US-led coalition forces, the US Department of Defense (DoD) said in a statement on April 13.