I understand that many people are very happy with a liner-lock Military. There are so many excellent reviews.
However, I do believe that there are also good reasons to make an advanced Military, with either a compression lock or with some of the 'misterious locks' (kidney lock, 'T' lock, ...) which are developed. But, let me talk about compression lock only, since I do not know anything about the other ones.
1. I remember a thread where it was said (Sal?) that there were plans to improve an original Military's liner lock to the SekurLock, one finds in the Centofante Jr. That was a great idea IMO, but probably would had led to a rather high price (my guess). Anyhow, the SekurLock would significantly improve security and reliability, especially in doing a heavy duty job.
2. It is clear that the security and reliability of the present liner lock is very high by any standards. However, I have noticed, very rarely, reports of a sudden lock failure (a very few, indeed).
3. I have a very positive experience with my Lil' Temperance, and, no doubts, a compression lock is a winner. So, I am dreaming about a Military with a comp. lock.
4. The reason for introducing a CompLock in Military is obvious from what I said above. Against? Maybe an additional liner would increase a weight, but it could be reduced using skeleton liners. Besides, there is no need to reach MBC lock rating, because we need a LIGHT folder. A CompLock would increase a price - probably not significantly (ParaMilie is in the same price range as Milie).
5. One thing to think about IMO is the following: I found enough threads at the Forums where people decided to buy some BM Axis knife only because Axis lock is superior to liner lock. And, many of them acknowledged a Military being better in other aspects!
These comments are made bona fide. They could be quite wrong, of course, since I am not an expert.
Franco