Tar Kyler-Time Traveling Mercenary

When ex-SEAL team leader, Tar Kyler is hired by an elite cartel to strong-arm a physicist who has created a time machine, the plan backfires and he becomes the scientist's protégé. With only months to live, he has to teach Kyler everything he knows as well as ironing out a few issues. When the old man dies of cancer, Tar hides the time machine from the Cartel and they have to deal with him from now on.
Although he does undertake several missions for the Cartel, Kyler refuses to put women and children in harm's way which alters plans- and he also has a few agendas of his own. Who he recruits to assist him, how he does what he is hired to do, and also wants to do, modifies the past, present and future.