Difference between BF4 and BF1 armor
Unlike in BF4, where only AT weapons dealt any damage to tanks, in BF1 most weapons deal some (albeit little) damage. Regular frag grenades, incendiary grenades etc. In fact the recent Fall Patch has increased the damage regular grenades deal to tanks.
Another thing is that unlike in BF4 where rear-armor was a tank's weak spot, in BF1 it's the tracks. Tanks can be easily immobilized if attacked from side.
AT weapons
All classes can equip light AT-grenades, which deal much less damage than heavy AT-grenades, but are lighter, and thus easier to throw farther.
Once you level up your assault, you'll gain access to AT mines, as well as the AT "rocket gun".
Snipers have K-bullets, which are specifically designed to damage armor.
Anti-tank rifles spawn as a battle-pickup (for example there is one at E flag on Sinai Desert Conquest).
Field guns and fortress guns also do high damage to armor and can be operated by any class. Their downside is that they're stationary.
HE mortar can do significant damage to tanks without the need of exposing oneself to direct fire.
AT mines, which can be dropped either by Assault or Artillery Trucks are extremely effective - 3 mines can currently take out any armor in the game.
And of course, tanks are vulnerable to bombs dropped from airplanes. The Attack Plane can be equipped specifically for tank hunting.
There are lot of similarities with Rush. Like in rush, the attackers are given a limited number of reinforcement tickets. In Operations by default it's 250 for 64 players, 200 for 40 players (150 for both prior to the fall update). When an attacker dies, a ticket is lost. When Medics revive a teammate, a ticket is refunded.
When tickets are at zero, game continues as long as there isn't a flag fully in defenders possession (so for example either both are disputed or one is taken by attackers, other is disputed).
Unlike Rush however, in Operations advancing to next set of objectives does not fully reset the ticket count, instead you get additional 50 tickets (30 prior to patch). There is however an opportunity to gain some additional tickets. Retreating defenders are marked and killing each of them grants attackers 3 tickets (2 prior to the fall update)
Best Answer
I thought at first it might be the SMLE variant for completing the final War Story, but that's not the case. Then I thought it might be a super rare Supply Crate unlock. Not that either. Queue the Google search!
Information revealed here.
According to this thread from Battlefield's forum, the Lawrence of Arabia SMLE is a Deluxe Edition addition. You can get it by upgrading your game to the Deluxe Edition, but that will set you back around $20.
Buying the Premium Pass for the game only gets you access to all DLC for the game, not the special bonuses for higher tiers of the game (Deluxe or Ultimate).