A Military Times report, currently under review by the Army states that:
Emerging evidence presented in a May Center for New American Security report suggests that extensive use of shoulder-fired weapons like the Carl Gustaf recoilless rifle, the M72 LAW or the AT4 exposes service members to “overpressure” of the brain, the effect when a blast wave traveling faster than the speed of sound causes a ripple of the skull, generating additional pressure on the brain.