Lost Patrol is a Mastercraft Variant of the SDM in Call of Duty: Black Ops 4. It is apart of the Lost Patrol bundle available from the Black Market.
It has a total of two additional visual stages gained at 5 and 10 kills in Multiplayer, every 100 and 250 kills in Zombies and the first and second kill in Blackout.
The Lost Patrol in first person
Inspecting the Lost Patrol
The Lost Patrol in first person with the second visual stage active
Inspecting the second visual stage of the Lost Patrol
The Lost Patrol in first person with the third visual stage active
Inspecting the third visual stage of the Lost Patrol