If you’re judging “realism” by whether a film captures doctrine and institutional behavior (planning cycles, command relationships, friction), a few stand out.
1) “Black Hawk Down” (2001): It isn’t “special forces only,” but it captures task force integration, mission creep, and the way tactical problems become operational problems fast. It’s also one of the better depictions of confusion in urban combat and the limits of technology under stress.
2) “Zero Dark Thirty” (2012): More intelligence-to-operations than trigger-pulling. The pacing reflects how modern raids are often the end of long collection and analysis, not a spontaneous hero moment. It’s useful as a cultural depiction of post-9/11 CT machinery, though it remains controversial for what it implies.
3) “The Battle of Algiers” (1966): Not SOF in the modern Western sense, but essential for understanding counterinsurgency, networks, and urban clandestine conflict. If you want to understand why modern SOF and intelligence work so closely, this is a foundational text in film form.
For historical grounding, compare what you see to established doctrine and memoir literature—e.g., works on modern raids and reconnaissance, and classic accounts of SOE/OSS tradecraft. Films rarely get everything right, but the above at least respect the realities of organization, uncertainty, and consequence.