Operation Mirra demo addon - Half-Life

Briefing: Year 2015. Earth Defence Starfleet Command. Code name: Mirra.Freeman, we don't have anyone else to charge this mission with, our soldiers dissapeard without a trace. Our reconnaissance discovered alien activity on planet Mirra in Delta sector. According to our intel, aliens produce and test new type of battle ships under the code name "T-52". We already had a chance to experience firepower of those small, inconspicuous and deadly vessels that are propelled by unknown power source. We are afraid that Earth is on the edge of war... War between us and aliens. Some of our special forces managed to send us crucial intel from planet Mirra to Earth about alien base. Thanks to that data we know when to deploy our next team to stop T-52 launch and destroy it. We lost contact with our previous strike force and we suspect that the members of the team were killed. You have vast experience with alien technology so using weapons that you will obtain on the planet shouldn't be a problem. Since we can't transport you with equipment we are left with only one option - you will have to be dropped without it. We've traced the location of aliens Space Center from which they control launches of T-52 rockets. It seems that they're launched like rockets but they can fly and land just like airplanes. You will be deployed close to that facility but you still have to reach it on your own and stop launch of prototype. However if you are unable to infiltrate enemy base your order is to destroy as many as possible strategic targets including T-52 spaceship about which whereabouts we have limited data.

Mission objectives:
Stop T-52 launch.
If it's possible, inflitrate the base and destroy as many enemy strategic targets as you can. We will be trying to update information on your target locations as much as possible.
Find and destroy T-52 prototype

If you succeed, we will have more time to prepare for the upcoming conflict.
Remember that you will be on your own and that you will have to obtain weapons and ammunition from aliens.
Maybe you will be able to locate our missing troops too. Good luck!

P.S.: Oh, and we almost forgot... you will have to escape the planet by stealing alien spaceship.