The monster
military base - not just RAF (or RFC) favours Ismailia.
The shape favours Alexandria (now El Nozha) but there's not enough barren rock there.
Fayid is now surrounded by sand so where has all that construction gone ?
In short, I'm not betting on the other two - my only bet (apart from Sabre is right - S i R
) is
Ismailia and that's a long shot. LFH
Added - and my remark about Fayid would equally apply to Kabrit.