Perchance to Dream
A dead soldier follows the light at the end of the tunnel but discovers his own personal afterlife is nothing he could have imagined.
Set in the near future when corporations are more powerful than governments and fight each other for the solar system's resources, a soldier falls on the Martian battlefield only to wake in a dark tunnel. Following the light ahead he enters an office with a clerk waiting to discuss his contract. He is dead, that is beyond question, yet that doesn't mean his corporate employers are done with his services just yet.