The distinctive unit insignia was originally approved for the 240th Coast Artillery (HD), Maine National Guard on 8 February 1929. It was redesignated for the 703d Antiaircraft Artillery Gun Battalion on 2 February 1950. It was redesignated for the 703d Antiaircraft Artillery Battalion, Maine National Guard on 9 January 1956. The insignia was reassigned for the 240th Artillery, Maine National Guard on 16 May 1961. It was redesignated for the 262d Engineer Battalion and amended to change the symbolism of the design on 2 March 1971. The insignia was redesignated for the 240th Regiment, Maine Army National Guard, with description and symbolism revised on 5 March 1997. It was amended to correct the symbolism on 26 September 2014.
240 REGIMENT SEMPER PRIMUS ET FIDELIS ALWAYS FIRST AND FAITHFUL
262 ENGINEER BN ARNG ME
703 ANTI AIRCRAFT ARTILLERY GUN BN