After a few months studying engineering in college, he returned to military service in 1989 and served as squad leader in a pioneer platoon in UNIFIL (1991-1992).

Bjørnar Moxnes said that for 15 years, Norwegian authorities have celebrated this operation as a great victory, while our closest allies all along have known that this was a whopping failure in which considerable military resources were used to imprison an impoverished Afghan; furthermore, Norway's official Afghanistan-investigation made a success-story out of the operation in which Norwegian special forces with American support, exploded their way into a house with women and children and abducted an Afghan bricklayer in the belief that he was a Taliban leader.

[12] Furthermore, VG (newspaper) leaned heavily[12] on to classified information from Afghan War documents leak to unravel the events and the timelines of the military operation.

[13] Mohammed Naseem was killed in 2010; in 2011 Norwegian media reported his death and that "therefore the lawsuit" would not materialize; later in 2011 Kristoffersen got War Cross with Sword.

[14] In February 2023, media said that the armed forces is not revealing which colleague of Kristoffersen, wrote the recommendation (in January 2010) that Kristoffersen should get "a medal of valor"; furthermore, the identity of the two superior officers that gave support to the recommendation, is still being withheld (as of Q4 2023);[15] one of the latter added a disclaimer (or reservation)[16] to the support: "however",[16] the council that decides should consider if the war cross with sword is (really) the right award.

As of December 2023, the Minister of Defence is refusing to release information that will answer three specific questions from Ingrid Fiskaa, MP.

[23] The Defence University College's chief instructor (hovedlærer) of Leadership, Jostein Mattingsdal, said in March 2024, that the news articles are "a sad chapter of the Armed Forces".

Kristoffersen wrote the book Jegerånden- Å lede i fred, krise og krig [ The Jäger spirit – to lead in peace, crisis and war] (2020).