Seated in the rear seats are General John P. Kirk and Major Soller. The driver is Howard Johnson. The doughboys surrounding the veteran vehicle are members of the 32d Division.
It was after the Mexican affair that President Woodrow Wilson appointed Pershing to command the American army.
The chase of Pancho Villa was previously covered in detail in https://justacarguy.blogspot.com/2015/08/heading-into-mexico-after-pancho-villa.html
and was incidental in https://justacarguy.blogspot.com/2015/12/pharr-texas-had-no-fire-department-and.html