In this one NRP my nation happened to be a major exporter of high-tech waste disposal and fabrication products based off of energy-matter conversion. The Earth became uninhabitable due to the one-two punch of an antiproton attack that destroyed a quarter of Africa and two nanoviruses. The UN met on an orbital station to discuss what to do, when terrorists attacked (Not one UN meeting happened in this RP without a terrorist attack). Well, these same waste disposal and fabrication devices were used by my nation as teleporters. A fleet came in to stop the terrorists, but the UN delegates were in danger. Leading them to a trash can, my delegate told them to all jump in while he hacked the station network to let the teleporters on the starships connect to it. Everyone got away safely.

Then there was the time that the reapers were invading in the precursor to my current NRP (We liked references, okay?). My humans were desperately trying to hold them off with the other species, but they were running out of ammo quickly. When their ammo was all spent, the entire fleet burned as hard as possible for the reapers, launching escape pods on the way. Those escape pods also burned as hard as possible for the reapers. The Reapers didn't have a fun day.

But what I'm most proud of?

The international dick measuring that took place in that one Roleplayer's Resort all that time ago.

An entire nation's starfleet came to a random island to put on a lightshow and prove how much more awesome they were than another nation's.

Then the artificial moon came down and did the same thing.