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Veterans face a lot of adversity when it comes to burn pit exposure. Three things are needed for service connection, exposure and service, a current disability, and a nexus between that exposure and their disability, the Nexus piece is usually the most difficult to establish and with Chris, because the onset was in service, the VA found that there was a nexus. For most veterans, the disability manifests after service, and so, without a presumptive for conditions due to burn pit exposure, the burden is on the veteran to present evidence of a medical nexus between their current disability and their burn pit exposure. Most of the time, the VA doesn't recognize the connection.