Another reality another outcome.....

Shephard is currently stationed in Santiago military base - Arizona there you're part of an special elite force called H.E.C.U - the Hazardous Environment Combat Unit. Of course you're very proud to be part of such a highly decorated military unit. The training was certainly hard but Shephard and that is you never gave up. At the moment our hero is heading over to the firing range for some training as suddenly all alarms sirenes started howling all over the place. Something is up and it's something big. Your entire battalion has been ordered away to a top secret facility only known to public as Black Mesa which is somewhere located in new mexico.

And here it begins. Witness a catastrophe of unknown magnitude as you get deeper in side the facility. Your mission is simple evacuate and resuce as many survivors as you can find out what really went wrong.

Are you good enough to be a real soldier? Can you reveal the truth about the events that occurred in Black Mesa or will you fail bitterly die trying? Find out when the mod gets released.


- Intence storyline awaits with many surprises for the player.
- An enviroment that almost feels alive.
- Many custom voices & sounds.
- Several new monster skins to give the players more variations when fighting the Monster hordes.
- 4 complete chapters with over 30 maps.
- Visit & revisit new & old areas of Black Mesa.

My Team and mod contributors:

"23-Down" - Mod Leader, Lead Story Writer, Lead Level Designer, Lead Texture Artist, Lead Sound Engineer.
"Neclipse" - Level Designer, Technical Advisor, Voice Actor, Game Tester.
"Thanoshlthebeginning" - Level Designer, Game Tester.
"M82sniper" - Model Skinner, Game Tester.
"Awkook" - Level Contributor, Voice Actor.
"Kaeps 133" - Game Tester.

Image RSS Feed Latest Screens
Betatesting has begun Xen Infestation Black Mesa
Blog RSS Feed Post news Report abuse Latest News: Side project Military Duty released

1 comment by 23-down on Jun 28th, 2015

Well folks the long wait has finally payed out... Today - my first mod ever to be constructed for Hl1 has been released and seen daylight.

I'll make this post here brief as I've created a separate mod page for the mod which still awaits authorization.

Anyway for those of you who wanna get it...

Get it here:

Military Duty

Note: It has come to my attention that this mod is not compatible with the old WON version of Half-Life. Please play it only on Steam Half-Life. If you do play it on WON expect game crashes- missing music and other glitches. Old WON simply can't handle the code enhancements Valve made over the years for the Hl1 Steam version games and I build my mod with these enhancements enabled so I wasn't taking the limitations of WON into consideration.

The mod still has few minor glitches left but nothing serious so don't worry the mod is fully playable.Still at some point I will release a patch for it.

Anyway I wish each one of you lots of fun and do hope that I will get vast feedback in return from you folks. Be it positive or negative as long as it is constructive criticism. :) I estimate a playtime around 1 to 2 hours. Also I recommend playing it on hard as easy is to easy. And please read the readme. Good luck on your mission Soldiers. :)

Post comment Comments  (10 - 20 of 127)
Khilev Aug 10 2013, 5:51pm says:

This looks really awesome :)

+2 votes     reply to comment
halflifegamer Feb 16 2013, 9:13pm says:

This mods for half life opposing force are awsome and this one too. Finish it quick dude I want to play the full version of this mod or take your time in finish this mod I got no problem.

+2 votes     reply to comment
naorzi Jun 8 2012, 5:39am says:

how can i download this mod ?!?!!?

-2 votes     reply to comment
Guest Nov 24 2012, 2:37pm replied:

I am waiting too. Can I get an email notification when it's ready?

+1 vote     reply to comment
MachoMan89 Jun 20 2012, 10:57pm replied:

not done just yet.

+2 votes     reply to comment
HECUBAKERCHARLIE041 Feb 25 2012, 10:50pm says:

awesome map style!

+2 votes     reply to comment
shepardatwar Jan 29 2012, 1:21pm says:

I'm sure it'll be the best half-life mod .

+2 votes     reply to comment
ThatMercenarySnake Dec 23 2011, 7:47am says:

modding opposing like trying to mod a game that cannot be changed

-2 votes     reply to comment
carloscarlin Dec 3 2011, 7:41pm says:

I voted for this mod

+2 votes     reply to comment
EDOC_32 Dec 2 2011, 8:46am says:

Voted for "The Mod Of The Year 2011" :D

+2 votes     reply to comment
23-down Creator
23-down Dec 2 2011, 5:46pm replied:

:D Thank you.. :)

+1 vote   reply to comment
Post a Comment
click to sign in

You are not logged in, your comment will be anonymous unless you join the community today (totally free - or sign in with your social account on the right) which we encourage all contributors to do.

2000 characters limit; HTML formatting and smileys are not supported - text only

Half-Life: Opposing Force Icon
Send Message
Release Date
Mod Watch
Track this mod
First Person Shooter
Single Player
Embed Buttons

Promote Hl Opposing Force - Firestorm on your homepage or blog by selecting a button and using the embed code provided (more).

Hl Opposing Force - Firestorm
Hl Opposing Force - Firestorm
Last Update
1 week ago
221 members