It was originally thought that the three men in the photo were (l to r) General Connatto "Connie" Linguino, a South American enforcer of a certain oligarchy's semi-official rule, Donald Towner and Phil Bolley. With the publishing of the third novel, When There Were No Shadows, we discover that:
The person the left is a minor Peruvian politician, now deceased.
In the center is a helicopter pilot from Texas who played a role in the rescue of a ranch on the Alto Plano. On the right is an unnamed mercenary. In the background you can see the steep slopes of the mountains rise in the setting sun. This picture is identified only by a pencil note on the reverse that gives the name of the country, Peru, "C.L. and P.B.", whatever that means.
Specifically where this picture was taken and for what purpose, is unknown. The rocky out-crops and moon-scape scenery certainly look like Peru. 'The mercenary seems to be carrying some type of sniper rifle and is in military garb. If that is the Gamonale of the area, he is, for some reason, displaying a ferocious smile. Possibly not all of the book is made up.
The gamonale is armed as well, but one cannot determine with what. The gyro pilot seems to be wearing some kind of left handed shoulder holster. The mercenary appears to be all business.
If the picture is authentic and slightly corroborates the events of Whirlwind III, Towner would have been around 47 or 48 years of age. See the following picture.