Question

By this time next year, I____(complete)
15 years of active service​

Answer 1

By this time next year, I will complete

15 years of active service.

The answers is "will complete" as over here they are talking about future and "will" shows future

"Will complete" is the answer.

Answer 2

I think your answer will be---By this time next year, I will complete 15 years of active service....

hope it helps u and plz mark as BRAINLIEST