I don't know - Cuba?

Let's see... US pattern khaki, I think. Colored shoulder straps, maybe piping on pointed cuffs. Shield on collar, eagle and shield on cap. The card is inscribed "Recuerdos. To Pep. From Louis." (Not sure about the name Louis.)

Could also be Puerto Rico Insular Police from the early period of US rule. Their uniforms change every so often and in the early years they wore khaki, then blue, then gray, and now light blue shirt/dark blue pants.

Take away the flags and you may have a contender,
This is from the Colombian regulations of the 50's, this badge could possibly be an undated version of the above... or even a police version of the military badge!
Going off the design of the eagle/bird on the badge, there's a good likeness to the one on the cap.

Panama? Canal Police? Have to look at my books when I get home.

Could this be Philippines Constabulary? Red shoulder straps?

You know Michael, upon closer examination it could be. The PC had a distinctive eagle upon a shield insignia in their early years.

And of course Philippines was previously under Spain so would still fit Spanish inscription, also the background with the hut looks that part of the world

Michael, do you by any chance have the book Military Uniforms in America: The Modern Era from 1868 published in 1988 by the Company of Military Historians? In this book is a color illustration of a Philippine Constabulary officer wearing a very similar uniform. I think your right, good job on bringing up the Philippine Constabulary!

I will try and scan the page after Thanksgiving.

According to the Chapman and Elting plate in Military Uniforms in American: The Modern Era from 1868, early on soft cottony steel-grey camano cloth was adopted to distinguish the insular police from the army. Khaki gradually replaced the grey, still with red piping and shoulder straps.

The metal insignia is detailed thusly: "[Officers'] Cap insignia was a 'small brass or gold eagle.' Red shoulder straps carried the same eagle insignia [as] on the cap, and the insignia of rank. ...On 12 September 1905, a new collar insignia was authorized: the 'coat of arms of the government of the Philippines, less the crest and the scroll...' This was cancelled in 1906; in 1907, a 'new design' in gold was introduced, undoubtedly that shown at the top of this plate. It is, like the 1905 insignia, from the Philippines coat of arms, with the letters 'PC' in silver superimposed. The officers' version is surmounted by an eagle."

From the plate, we see the collar insignia is a wreathed "PC". Note on the other constabulary plate above, post 1912, the officer's collar insignia on the khaki uniforms in the back of the illustration appear to be the coat of arms without the eagle, as in the photograph.

To sum up, I now think the photo is of an American officer of the Philippine Constabulary circa 1912-14, in khaki uniform with red piping and shoulder straps.

One last detail: in 1911 the PC issued orders to conform to US Army officer rank insignia, with third lieutenants to have the same devices as second lieutenants. So I presume that before 1911 third lieutenants had no rank device, as the person in the photos.

Maybe being constabulary makes some kind of sense out of the inscription on the back of one photos: An exceptionally fine rat chaser: Note: The third eye brow. Use a large reading glass. Louie.

[i]