Formula for reading latest date

Hello everyone, I am in serious need of a formula in the next few hours. I have attached an excel form to show what I need. I need a formula in column G that will replicate "keep" and "delete" like it is shown in column C.

Rules are -
The formula needs to read the latest date in order to show "keep" for each ID in column E.
Each identifier will have two dates that are the same, both should be "keep", but only for the latest date.
If an identifier has one date, like LX4, it is a "keep".

Does anyone know of a formula like this???? Please help....thank you!!!!!