Ok, since Fleet Marks have been taken from Officer Reports, its high time to share good ideas as to how to get some back using whatever methods remain.
This may not be new info to a lot of people, but if it helps one other person or fleet to get around this situation, then its worthwhile.
1. FLEET MARK/CXP BOOSTER
If you have Fleet Credits/EC to spare, get yourself a Fleet Mark Booster from your Fleet Starbase, and a CXP Booster from the Exchange. They give a 20% boost to any CXP/marks that you do earn. This is a must, for either/both methods
2. CXP Turn-In
Every 10k DOffing CXP over 110k in a field, can be exchanged for Fleet Marks (more, with the bonus). Some of the best CXP missions however, come from shipboard assignments- your Ready Room (Mil/Esp), Sickbay (Medical), Science Lab (Researching samples), and Engineering - ALL give DOff missions that offer comparatively large CXP rewards.
These are mostly high-value CXP missions, all on your own ship. Get a Crit, and you could be looking at 5,000 CXP in a field for one DOff mission - thats half your turn-in requirement for that single field. Even with Greens, you will still get a high chance of success, and it all adds up.
Long and grindy I know, but its reliable for (literally) 5-10 minutes work per toon. More Toons = More CXP = More Marks...
3. Fleet PvE
Yes, I know it blows. Yes, there are AFKers killing it, and yes these missions generally suck. However, both the limited reward AND the AFKers can be avoided, by one simple trick. Keep them within your own fleet, like many people do with STFs. If a mission rewards 20 FM each, you and 4 fleetmates can earn 100+ fleet marks in 10 minutes. Or more, if you all are using boosters.
I know it sucks, and I think taking FM from IOR will be the death-knell for a lot of fleets, but there are a few tricks out there to get around it.
If anyone else has any ideas to add, please feel free to add them in.
Mods - please dont move this for a little while, as its relevant general information given whats happened.
Some of the best cxp rewards for doff missions come from the "current map" list in the gamma quadrant. The ones w/ the brownish background and generally require resolve on one or more doffs. I routinely crit on these and get 1k in cxp for a 4-6 hr doff mission.