Lia Williams is part of the top secret CIA military / border patrol unit called Task Force 47 (TF-47). She is US border patrol.

Smith is part of SEAL Team 10. He operates with border patrol but he hates doing it by all the means he wants to be in " a real war zone " other than that. He's not that funny but he can be at sometimes.

Jack is Delta Force He's the one who's been here for a very long time taking out cartel bosses and etc he knows all of the ambassadors just in case of an attack at the United States Embassy in Mexico.

Dalton is part of the CIA paramilitary force. He's really funny and he is the Gunner who holds the Mk 19 on top of the Bearcats and MRAPS.

Max Jackson also known as Max or Maxie is part of the Green Berets. He's the one who guns the M2 Browning and M240 on top of the Bearcats.

Ambassador Williams is the ambassador in the United States Embassy of Mexico He's deeply into the Benghazi attacks from 2012. He's just a businessman and he's deeply afraid of the cartel terrorist.