Company D 1 - 181 Infantry Company D 1st Battalion 181st Infantry Regiment is a heavy weapons company in the 181st Infantry Regiment . It provides anti - armor and heavy machine gun support to the battalion operations . In the National Guard , companies sometimes have two histories . They share the history of the regiment to which they are assigned , but also may have a unique company history and lineage . Therefore , Company D 1 - 181 IN shares the long history of the 181st Infantry Regiment ( United States ) . This site concentrates on the unique history of Company D as a militia / National Guard company in Hudson , MA . The company traces its history to 1864 during the Civil War , when it was first mustered as the Company I , 5th Massachusetts Infantry . It later served as a federalized Massachusetts National Guard regiment with the U . S . Army during War with Spain , Mexican Border Campaign , World War I and World War II . Most recently the Company D has served in New Orleans following Hurricane Katrina , in Iraq and in Afghanistan . History . Formation and Civil War . The present Company D 1 - 181 IN , was first mustered as Company I of the 5th Massachusetts Infantry on 18 April 1864 . The company saw service for one hundred days , and was sent to Baltimore , Md . , where it did guard duty at Fort McHenry , Fort Marshall , Federal Hill , and other places . National Guard and overseas service . In 1894 it was named the Hudson Light Guards . In June 1898 The Hudson Light Guards was mobilized for the war with Spain and served at Gunville , South Carolina . The Land forces of the Massachusetts Volunteer Militia were redesignated as the Massachusetts National Guard on 15 November 1907 . On 26 June 1916 , Company M of the 5th Mass . Infantry was mobilized for service on the Mexican Border at El Paso , Texas . World War I . In the First World War the company sent many of its soldiers to Company M of the 101st Infantry , the remainder of the Company served in France as part of the 3rd Pioneer Infantry Regiment . The pioneer regiments included such specialists as mechanics , carpenters , farriers and masons . They were supposed to work under the direction of the Engineers to build roads , bridges , gun emplacements and camps " within the sound of the guns . " They received standard infantry training so that they could defend themselves , but there are very few documented instances of any pioneer troops unslinging their rifles . Demobilized in July 1919 at Camp Dodge , IA . In 1923 the Company was redesignated as Company L 1 - 181 IN . World War II . The company was mobilized in January 1941 for one year of training with the Yankee Division . The year of training ended in December 1941 but the company ’ s service continued after the Japanese attack on Pearl Harbor brought the United States into the Second World War . Company L was relieved from duty with the 26th ( Yankee ) Infantry Division and served with the 181st Infantry Regiment on coastal defense duty until January 1944 , when the 181st Infantry was broken up with the soldiers going to be infantry replacements in the Italian Campaign . In 1946 , The 181st Infantry was re - established . The WWII battle honors and service in the Army of Occupation in Austria of the 328th Infantry were credited to the 181st Infantry . The Company served through the Cold War . Later service . After World War II the company in Hudson became a tank company assigned to the 110th Armor and 110th Cavalry Regiments . In 2005 The company became Company D 1 - 181 Infantry . In September 2005 , Company mobilized as an element of JTF Yankee for rescue and security operations in New Orleans following Hurricane Katrina . In May 2007 , D Company mobilized in support of Operation Iraqi Freedom . The unit ' s mission was to operate as a Personnel Security Detail for the U . S . Ambassador to Iraq , State Department personnel , Baghdad Provincial Reconstruction Team and the U . N . ' S Special Representative to Iraq . In August 2010 , Company D 1 - 181 IN deployed for one year of service with the International Security Force in Afghanistan in support of Operation Enduring Freedom . The company coordinated force protection at Camp Phoenix and conducted security operations in Ghazni , Zabul and Farrah ( detachment from Arizona National Guard ) Provinces . Battles . Global War on Terror , Company D 1 - 181 IN