Could someone confirm the following posting /

I am undergoing the biography of Flying Officer William Russell RAAF and I am trying to solve the following from his record:
posting 21 OTU 26/05/43 Mareton in the Marsh (difficult to read)
144 squadron 22/08/1943
1652 CU 07/09/1943

Then : 27 OTU 25/05/1943
466 Sqn 22/08/1943

If he was posted to 144 sqn was it with his crew , did he flew operation

Thank you for your help

From a sunny Belgium