Image from a military subreddit, 2 SAS men entering through a window

When I searched Google for SAS, I found a really cool picture of 2 SAS men (from the counterterrorism unit I believe) conducting a training mission and entering through a window.

It was from a reddit post (military subreddit I believe?) They wore blue kits and not the black ones, and I think they were carrying Sten guns, not MP5 guns. The caption was I think "2 SAS men with blue kits entering through a window carrying Sten guns"

One guy already entered and was crouching, the other one was still trying to get through, with his feet on the window sill.

The outfits were similar to SAS in the 80s with SF10 or either SF6 gas masks. They wore blue kits.

I also remember that the comments had people joking about the curtains in the window being beautiful and how they wanted to get them on their windows.

Here is a (very bad) recreation I made. https://500px.com/photo/1070649678/bug-eyed-men-by-quadrillingus-bruhingus

If anyone can help me find it, it would be greatly appreciated. Thank you!