What does Rear Guard Patrol reward?

No reward has been recorded for Rear Guard Patrol yet.

Where does Rear Guard Patrol start?

It was picked up in Tirisfal Glades.

Its level has not been recorded yet; it shows once a player accepts it with the addon running.

Yes. Its quest id is not in Classic Era, so it is part of what Forever adds.

World of Warcraft: Forever · quest · new since Classic Era

A quest in World of Warcraft: Forever in Tirisfal Glades. Recorded by 1 player running the addon.

Level, giver, pay and objectives show once a player with the addon accepts the quest.

No reward item has been recorded for this quest. The offer window fills this in when a player with the addon opens it.

What does Rear Guard Patrol reward?: No reward has been recorded for Rear Guard Patrol yet.
Where does Rear Guard Patrol start?: It was picked up in Tirisfal Glades.
What level is Rear Guard Patrol?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is Rear Guard Patrol new in WoW Forever?: Yes. Its quest id is not in Classic Era, so it is part of what Forever adds.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Tirisfal Glades