Hey Bunny. the main problem at the moment with your request is that it an engineer with a rocket launcher firing is a specific render and requires an original source.
What I'm asking is if you could provide us with a screen shot of an engineer in the middle of firing.. or at least aiming down the sites from a side profile view it would greatly speed up the process.
As a Pc bc2 user I could get it quite easily but I'm sorely lacking in friends who want to pose for me. Maybe its cause its 5 o'clock in the morning but... eh.
Once I get a render of the engineering firing (do you want a Russian engineer or an American one?) I'll post up the file here. Its not really my style (if you look at all my other works they all look similar lol) , but I believe others may have a better interpretation of your request. Tbh, I think signatures from BasicKeel might suit you. But nevertheless I'll put up my interpretation as well.
-Liam.