Ahead of a highly anticipated report the Pentagon will deliver to the White House on a new plan to defeat the Islamic State group, the biggest change employed by the military may be in the name of the enemy itself.

The Defense Department now officially refers to its primary foe in Iraq and Syria as "ISIS," according to a memo the Pentagon issued earlier this month.

Since the campaign began in 2014, military officials grappled with President Barack Obama's preferred "ISIL," short for the Islamic State of Iraq and the Levant, a more regionally sensitive and accurate translation of the terror network's geographic scope but hardly as verbally pliable as Trump's go-to term.

"The Defense Department will use the term Islamic State of Iraq and Syria, or ISIS, when referring to this threat," Defense Department Executive Secretary Michael Bruhn wrote in a Feb. 13 memo obtained by U.S. News and sent to each of the military departments and leaders within the Pentagon. It cites the memo the White House released on Jan. 28 calling on the defense secretary to prepare a new plan to defeat the Islamic State group.

The review Trump ordered on Jan. 28 is due by Tuesday and calls on the military, intelligence agencies and departments of State and Treasury to develop "comprehensive strategy and plans for the defeat of ISIS." It follows the president's repeated pledge he would defeat ISIS, which he said he would achieve "with very fast results."

Military officials may also use the term, "Daesh," a derogatory Arabic acronym favored among America's allies in the war against the Islamic State group.

"We view ISIS, ISIL and Da'esh as interchangeable terms for the same thing," Pentagon spokesman Navy Capt. Jeff Davis said in an email to U.S. News. "ISIS is the term most known and understood by the American public, and it is what our leadership uses. This simply aligns our terminology."

As a candidate Trump called out Obama for his choice of term, citing the more popular alternative.

"Wish Obama would say ISIS, like almost everyone else, rather than ISIL," Trump tweeted in December 2015.