Poor in concept and execution. The levels are mostly quite large and barren, not very interesting to look at. Even the levels that are directly ripped from Half-Life look noticably worse. The encounters are not paced very well, being so frequent to the point that the game almost feels like one long broken-up encounter that you're constantly fighting. There are several excessively long elevator rides, and the fight at the end will literally block you with an invisible wall until you have defeated all the enemies the game wants you to, an awful design decision that flies in the face of Half-Life's game design. This feels like it was someone's first attempt at making a mod, and I hope they went on to make things better than this.

This mod really surprised me with how good it is. The level design is very good, both in terms of visuals and gameplay. I've seen mods try to have a big climactic final showdown in a huge battle and fail miserably, but this mod actually succeeds in this regard. The sole weak spot in this mod, in my opinion, is the Gonarch fight, but I also don't really like the Gonarch fight in Half-Life so that's not really a fault unique to this mod. Military duty is honestly in the same league as Field Intensity and Echoes, and I think it deserves more attention. Overall, this is a very good mod!

This mod is the second in a quadrilogy of mods - Operation Rosenberg, Escape from Area 99, Operation Rift, and Dark Future. I think this is the best mod in the trilogy, but even then it's just alright. The gameplay isn't great, but it is okay. I think the reason I like this mod the most of the three is because it's silly enough to be charming; it introduces a lot of very strange concepts to the Half-Life universe that are completely incongruous with what the series is about, but it certainly is entertaining. But I still wouldn't recommend this trilogy, it's overall not great.