Fort McCoy , Wisconsin Fort McCoy is an active United States Army installation . It is located on 60 , 000 acres ( 240 km ) between Sparta and Tomah , Wisconsin , in Monroe County . Since its creation in 1909 , the post has been used primarily as a military training center . History . The post has been in virtually constant use since it was first formed as the " Sparta Maneuver Tract " on 14 , 000 acres ( 57 km ) in 1909 . At first , the tract was made up of two camps , Camp Emory Upton and Camp Robinson . These were separated by a line of the Chicago , Milwaukee , St . Paul and Pacific Railroad that ran across the land from east to west . In 1910 , the army renamed the entire tract " Camp Bruce E . McCoy " for Robert Bruce McCoy , a retired major general who first proposed the area as a training ground and bought part of the property on which the fort stands . In 1926 , the name of the post was shortened to " Camp McCoy " . In 1938 , the United States began a major expansion of the camp . This included the addition of over 45 , 000 acres ( 180 km ) to the post , as well as the construction of several new structures including living quarters for the troops . This increased the camp ' s capacity to 35 , 000 soldiers . In all , the project was estimated to have cost about $ 30 million . The expansion was officially concluded with a new inauguration on August 30 , 1942 . During World War II , Camp McCoy was used as a training facility for units from across the United States that were preparing to enter combat . The post was also used as a prisoner - of - war ( POW ) camp during the conflict . The camp was briefly deactivated following World War II , but with the advent of the Korean War in 1950 , it was once again used for training . This continued until 1953 , when the camp was again deactivated . It was then used to house various small national , state and civilian projects , and served as a training center for the National Guard and the Job Corps . In the 1970s , a variety of ideas were offered to make use of the camp ' s land including a suggestion by researchers to balance Wisconsin ' s population distribution by creating a major city on the 60 , 000 acre ( 240 km ) post that would rival Milwaukee . In response , a Milwaukee official proposed that the camp be used as a landfill for Milwaukee garbage . In 1973 , the Army reactivated Camp McCoy as a permanent training center , and on September 30 , 1974 , it was officially re - designated as Fort McCoy . In the 1990s , a second major construction project was undertaken , costing around $ 140 Million . Today , Fort McCoy serves as a Total Force Training Center . Around 100 , 000 members of the military are trained at the fort every year , and the total number has exceeded 149 , 000 in the past . Fort McCoy also is the headquarters of NMCB - 25 or Naval Mobile Construction Battalion Two - Five ( Spades and Clubs ) which served a distinguished tour in Iraq and SOUTHCOM ( including Cuba , Jamaica , Dominican Republic , and earthquake disaster relief to Haiti ) . Deployments . The 769th Engineer Battalion and the 927th Sapper Company of the 225th Engineer Brigade of the Louisiana Army National Guard mobilized for deployments to both Iraq and Afghanistan in 2008 and 2009 . 194th Engineer Brigade mobilized from Fort McCoy to Iraq in 2009 and 190th Engineer Company mobilized to Afghanistan from there in 2010 , both are part of the Tennessee Army National Guard .