Fort Indiantown Gap, also referred to as "The Gap" or "FIG", is a census-designated place and National Guard Training Center primarily located in Lebanon County, Pennsylvania, United States. A portion of the installation is located in eastern Dauphin County. It is located adjacent to Interstate 81, 23 miles northeast of Harrisburg, just north of the northern termin…Fort Indiantown Gap, also referred to as "The Gap" or "FIG", is a census-designated place and National Guard Training Center primarily located in Lebanon County, Pennsylvania, United States. A portion of the installation is located in eastern Dauphin County. It is located adjacent to Interstate 81, 23 miles northeast of Harrisburg, just north of the northern terminus of Pennsylvania Route 934 at I-81's Exit 85.