This is in the mission category where the idea was to be able to “complete it in 1 match”. At least that’s what the patch notes said. But sometimes you can get several matches in a row, where you just can’t, because you are a Defender in Invasion.
My suggestion is to replace it with getting kills on a capture point. It keeps the purpose of the mission which means that you need to fight around the capture point to complete it. It can also be completed by either side on any mission type.
There is a button next to the mission to change it, if you haven’t noticed
Either that or switch the faction. Normandy allies one game and it’s done.
as a last resort 
I am aware. I use those rerolls on the other missions. But I’m unsure why this matters. They said that 1 out of 3 objectives is going to be always completeable in 1 mission. But this is the only exception. And failure is not dependant on you or anyone else, but the game.
I agree that kills on objective would be far better task. I play mostly Normandy Axis and it is 85% defend, 10% conquest 5% attack.
It is far better to use it on secondary tasks that are more likely to come with something impossible or tedious like pistol or melee kills.
you have misunderstood the always completable, they mean that you are always able to do it without certain actions, like killing 10 dudes with a knife you can always do it but it is more difficult to capture an area
Exactly? But this mission is taking up that slot? And you just said it can’t always be completed?
really if you really need to do it start a costum battle in conquest mode, I repeat you misunderstand you can always do it, they mean that it is easy to do
Every time i done that i got Le Bre defence as US. 
lol Ikr
I am convince this game is actually sentient
It is, because everytime i have booster, here, have an conquest.
Everytime i has to capture point, i have defence.
Im scared what will come next.
I know it’s called murphy’s law
You can complete those missions in custom matches too, it’s especially useful when your rerolls run out and you get stuck with “20 kills with a pistol” and you don’t exactly have a surplus of pistols on hand.
I know the feeling. Kill X planes and there are only kamikaze attackers. Destroy X tanks, TNT bounces and flies into sky for no damage or tank is blown up by others the second you throw your TNT, you set it on fire but somebody else finishes that crippled tank and you score assist. Need to be in top 30% - normally it is completed within several games but several days ago as it was part of the event it took me nearly 4h as no matter what I always ended up 4th. Not 5th, 6th or last but 4th every time. Those tasks can sometimes get ridiculous.
I did this today with flamethrower. I have it unlocked only in Normandy Axis and it is not great at defense, it is great for objective clearing but that is rarely a case there and also in live match I mostly score assists because of slow damage over time.
Agree simply because people will leave more games to get to conquest to complete it quickly.
We already barely have players in most matches, and the game starts to give more xp for afking than playing now.
“easy” tasks definitely need another look.
Mine right now is “get 10 pistol kills” which is pulling teeth even if I go around executing downed soldiers.
iv always liked 1 point invasion, it focus’s the battle to a specific HQ, its the 2 point invasion that always annoyed the shit out of me because you always end up losing one point since nobody defends it and it makes the game soo much shorter