 The first barrier would run from the coast some distance inland along the demilitarized zone and would seek to block the NVA infiltration through conventional means.The second barrier would run from the remote western areas of the border into Laos and would be a barrier of air interdiction, mine fields and electronic detection requiring minimal troops.While the JCS report had estimated the construction of a barrier would take up to four years, the JASON report suggested the barrier could be in place with available resources within a year.