You can find compatible subtitle files on these major repositories:

For the (or YIFY) 720p BluRay rip, you need subtitles that match a frame rate of 23.976 FPS . Using subtitles timed for the "Director's Cut" on a "Theatrical" rip (or vice versa) will result in "subtitle drift," where the text gradually desyncs from the audio. Release Name: Rambo.2008.720p.BluRay.x264-[YTS.AG] Format: .srt (SubRip)

A dedicated site that mirrors subtitles specifically for YTS releases. 🛠️ How to Use the Subtitle Download the .zip file from one of the sites above. Extract the .srt file.

Search specifically for the "YTS" or "YIFY" tag to ensure the timing is perfect.