The purpose of this manual is to provide information to enhance tactics and protection skills for those operating in high threat, protection and combat environments. This includes the operations of the following, by no means exclusive list: special operations forces (SOF), specialized military teams, security escort teams, high threat protection agents, tactical law enforcement and SWAT teams, paramilitary law enforcement teams, and also civilians intent on improving their tactical skills and knowledge. The information in this manual is derived from years of experience gained from training and operational service with SOF followed by years of employment as a security contractor in hostile environments including Iraq and Afghanistan. It is a distillation of military and security training, principles, and tactics, techniques and procedures (TTPs) adapted to the threat and environment anticipated in this type of scenario in order to provide knowledge needed to train tactical teams to operate effectively in high threat and combat environments.

Author’s blog: maxvelocitytactical.blogspot.com

Authors note on choosing Contact or Rapid Fire:
In the interest of fairness I want to put it out there that I don't intend that you buy both Contact and Rapid Fire. The reason is that they are not designed as sequels, but are simply aimed at different audiences. Thus, there is an amount of material, the main bulk of the tactical stuff, which is common to both books.
Contact is designed for preppers and does also cover all the small unit tactics. Rapid fire omits all mention of prepping and contains more information about OCONUS type operations. It is aimed more at a military and contractor type audience.
You will get the tactics necessary for your tactical team in whichever environment from either book. Contact has the additional stuff aimed at prepping scenarios and situations’ involving your family, Rapid Fire goes more into Iraq/Afghanistan style operations.
I recommend choosing one or the other depending on your particular interest. I recommend both books for training up tactical teams; they both contain the same core of tactical information.