I'm not convinced that mixed units would play nicely together at that specific operational level. I'm sure they're all professional enough to get the job done, but you have to trust the people you work with with your lives in those endeavours and if you're Army Special Forces-trained and used to doing things the Army way, you may not necessarily know, or see how it can be more efficiently done in that manner, the Navy SEAL way. A Ranger master sergeant and a SEAL chief petty officer may recognize the benefits of shared experience and points-of-view in how to tackle a problem, but may not necessarily agree on the best course of action.
And units that have trained together know exactly what each member of that unit is doing, needs to do, when to do it, and frequently how to do it, with the duplication of effort and multitasking that is necessary to do each others' jobs in case of casualties or timing issues. A mixed grab-bag of Army SF and Rangers, Navy SEALs, Air Force Pararescue or Combat Controllers, or Marine Corps Force Recon may not necessarily be the sum of their parts, especially if thrown together ad-hoc in a warzone.
In fiction it works wonderfully and the gestalt triumphs over all in their path, but in reality the blend would probably require a lot of time together as well as a strong leader to cut through the multiservice bullshit and turf wars.
I am reminded of something from Richard Marcinko's first "Rogue Warrior" book, where he discussed the formation of the U.S. Army's Delta Force; to paraphrase him, the powers-that-be thought Colonel Charlie Beckwith (the founder of Delta) was unduly influenced by the British SAS, and Marcinko thought Beckwith was unduly influenced by the Marx Brothers.
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