Quick Question: Do missions eventually go away?

[Battlescared]

Or do you have to fight every battle?  Normally I fight em all to resolution, but there are some times that I'd rather just let em disappear on their own like they used to in XCOM.  So just thought I'd shoot out a quick question to see.

[Visitor]

Yes, new missions pop up and old disappear after some time if you won't want to engage the enemy. Be warned though that disappearing missions - if I am not mistaken - are counted as lost affecting organisation's standing with the country the operation was to be performed in.

[Battlescared]

Ok, good to know.  Thanks.  I'm okay with the consequences of letting it go, just wondering if it would.  I had never let one go that long and there are a couple maps that are a royal pain (military bunker for one) and sometimes I don't feel like sacrificing people to smoke em out.