Like the team that is prominently featured in the film, Kane and his men were sent by Dr. Ventress (Jennifer Jason Leigh) to go to The Lighthouse and discover the cause of The Shimmer — but also like the team that is prominently featured in the film, the mission doesn’t go super well.
Kane is the only member who winds up actually making it to the end, but as seen on the camcorder in The Lighthouse he doesn’t complete his mission.
Instead, his confrontation with his duplicate instead forces him to lose all sense of self, and he commits suicide with a phosphorous grenade.
The cell-altering effects of the alien presence doesn’t sit too well with the soldiers/scientists, and as evidenced in videotapes they wind up kind of losing it as their bodies change in excessively strange ways.