Green Spring is a census-designated place (CDP) and railroad town in Hampshire County, West Virginia, United States.
 As of the 2010 census, its population was 218.
 Green Spring is located north of Springfield on Green Spring Road (West Virginia Secondary Route 1) near the confluence of the North and South Branches of the Potomac River.
 Green Spring is also the location of the South Branch Valley Railroad's terminus with the old Baltimore & Ohio Railroad mainline.
 Green Spring is the site of a one-lane low water toll bridge that connects Green Spring Road (West Virginia Secondary Route 1) to Maryland Route 51 in Oldtown, Allegany County, Maryland.
 This bridge is one of only 17 privately owned toll bridges in the United States.
 The toll for the bridge is currently US$1.50.
Doe Gully is an unincorporated community along the Potomac River in Morgan County in the U.S. state of West Virginia's Eastern Panhandle.
 Located along the old Baltimore and Ohio Railroad where it bisects a bend in the Potomac by way of the Randolph Tunnel, Doe Gully is only accessible by way of Doe Gulley Lane (West Virginia Secondary Route 18/2) from Orleans Road (West Virginia Secondary Route 18/1).
 It is located southwest of Orleans Cross Roads.
 The Chesapeake and Ohio Canal National Historical Park crosses the Potomac River onto the West Virginia side to Doe Gulley's west and it also lies directly across the river from it.
 Like most of the old B&O railroad stations and their communities, Doe Gully is popular with railfans.
Western Maryland is the portion of the U.S. state of Maryland that traditionally consists of Washington, Allegany, and Garrett counties, with western portions of Frederick County also associated with the area.
 The region is bounded by the Mason-Dixon line to the north, Preston County, West Virginia to the west, and the Potomac River to the south.
 There is dispute over the eastern boundary of Western Maryland.
 For most residents of the Baltimore-Washington area, everything west of Frederick city is considered Western Maryland.
 However, the people of the more mountainous and isolated Allegany County and Garrett County consider Sideling Hill the boundary between Western Maryland and what they refer to as "down-state."
Pinto is an unincorporated community along the North Branch Potomac River in Allegany County, Maryland across from Rocket Center, West Virginia.
 While the town is officially named Potomac, its post office is referred to as Pinto because there already exists a Potomac, Maryland.
 Pinto is located south of Cresaptown on Winchester Road.
Rocket Center, West Virginia is the site of a government installation known as Allegany Ballistics Laboratory, part of the Naval Sea Systems Command which is currently operated by Alliant Techsystems.
 Rocket Center shares a ZIP Code with Keyser but is located 15 mi north along the North Branch Potomac River in Mineral County, West Virginia.
 There are no residents in Rocket Center.
The West Virginia - Western Maryland Synod (8H) is a synod of the Evangelical Lutheran Church in America (ELCA).
 The synod consists of all ELCA congregations in West Virginia and Garrett County, Maryland.
 In addition, there are two churches from Washington County, Maryland, one church from Allegany County, Maryland, and one church from Frederick County, Virginia.
 The synod is headed by a bishop, currently Matthew L. Riegel.
Allegany Ballistics Laboratory (ABL) located in Rocket Center, West Virginia, is a diverse industrial complex employing some 1,000 people across 1628 acre .
 The facility is a member of the Federal Laboratory Consortium and is operated by Alliant Techsystems (ATK) under contract with the Naval Sea Systems Command (NAVSEA).
McKenzie is an unincorporated community in Allegany County, Maryland, containing only a few houses, and mostly land.
 Its name is derived from a family which owned a large farm along the river bottom in the area.
 It is directly across from the Allegany Ballistics Laboratory in Rocket Center, West Virginia.
 The area used to be a railroad junction of the Patterson Creek Cutoff and the main B&O line.
 McKenzie is also the site of one of the first settlements in Allegany county, where many pieces of glass, metal, stone, and some coin have been found.
 In the fields of the river bottom, arrowheads and flint can be found, suggesting a possible Native American community at one time, similar to the Barton, Maryland site.
Dans Mountain is located in Allegany County, Maryland, USA between Georges Creek and the North Branch Potomac River.
 The highest point on Dans Mountain is called Dan's Rock which has an elevation of 2895 ft .
 The mountain rises 2200 ft above the town of LaVale and the summit is the highest point in Allegany County.
 Although there are higher points in Maryland, Dans Mountain has the most impressive escarpment of Maryland's mountains.
 It is essentially continuous with the longer escarpment that continues both north (into Pennsylvania) and south (into West Virginia) known as the Allegheny Front.
Town Creek is an unincorporated community in Allegany County, Maryland.
 Town Creek lies on the Potomac River within the Chesapeake and Ohio Canal National Historical Park across the river from Okonoko, West Virginia.
 Town Creek takes its name from a nearby stream.

Question: McKenzie is an unincorporated community in Allegany County, Maryland, it is directly across from which diverse industrial complex, located in Rocket Center, West Virginia?
Answer: Allegany Ballistics Laboratory