It was called up for the Spanish–American War as the 13th Pennsylvania Volunteer Infantry Regiment, but did not serve overseas, and again to guard the Mexican border in 1916.

[4] In response to President William McKinley's proclamation calling for volunteers to serve in the Spanish–American War, the regiment encamped at Mount Gretna on 28 April, where it joined the rest of the Pennsylvania National Guard to be mustered into Federal service.

[3] The 13th Pennsylvania departed Mount Gretna for Camp Alger in northern Virginia on 19 May and arrived there the next day.

While stationed at the latter, the regiment participated in the 27 October Philadelphia Peace Jubilee celebration to commemorate the cessation of hostilities.

The 13th Pennsylvania again relocated to Camp MacKenzie near Augusta, Georgia, on 14 November, where it was mustered out of Federal service on 11 March 1899.

Returning from the border, the regiment was drafted into Federal service on 5 August 1917 after American entry into World War I.

It participated in the Third Corps Area concentration of the First Army maneuver, held from 10 August to 3 September 1935 at Indiantown Gap and Mount Gretna, which involved 20,000 troops, mostly from the 28th and 29th Divisions.

[10] It was called up for relief duty in western Pennsylvania between 17 March and 9 April 1936 after the Schuylkill and Susquehanna Rivers flooded, along with the rest of the division.

[8] Between 5 and 19 August 1939, the regiment participated in the Third Corps Area concentration of the First Army maneuvers at Manassas, involving 24,700 troops, mostly from the 28th and 29th Divisions.

[13] As a result of World War II, the 109th was mobilized with the rest of the National Guard and inducted into Federal service at Scranton on 17 February 1941.

It was ordered into active Federal service 5 September 1950 to replace Regular Army units fighting in the Korean War.

The 109th was released from active Federal service on 15 June 1954 and reverted to state control, with the NGUS 109th simultaneously dissolving.

[2] The 1-109th was ordered into active Federal service on 22 January 2005 for a deployment to Iraq in support of Operation Iraqi Freedom with the 2nd Brigade Combat Team, 28th Infantry Division, then the largest Pennsylvania National Guard combat deployment since World War II.

The battalion was ordered into active Federal service on 6 October 2012 for a deployment to Kuwait, in which it provided security at Camp Buehring.

[2][27] A Gold color metal and enamel device 1+1⁄8 inches (2.9 cm) in height overall consisting of a shield blazoned: Azure in fess, a sheathed Roman sword, point to base, and a giant cactus Or; on a chief of the last six fleurs-de-lis of the field.

[28] Azure, in fess a sheathed Roman sword, point to base, and a giant cactus Or; on a chief of the last six fleurs-de-lis of the field.

[28] That for the regiments and separate battalions of the Pennsylvania Army National Guard: On a wreath of the colors (Or and Azure) a lion rampant guardant Proper holding in dexter paw a naked scimitar Argent, hilted Or, and in sinister an escutcheon Argent on a fess Sable three plates.

[28] One soldier, Technical Sergeant Francis J. Clark of Company K, received the Medal of Honor for his actions from the 12th to the 18th of September 1944 while serving with the 109th Infantry during the Siegfried Line Campaign.

This article incorporates public domain material from websites or documents of the United States Army Center of Military History.