The engraving says:
SAYONARA
CAPT EDWIN H. ENGELKING
22ND MAS
MAC
MAR 64-DEC 66
KANPAI
Glass-Bottomed Silver-Plated Mug/Tankard/Stein, Engraved Military Vietnam Capt.
$7.99
Object Type
Mug
Theme
Breweriana
Brand
Unbranded
Country/Region of Manufacture
Unknown
condition
Used
This is a 16 oz. mug (filled to the top) and it's about 5 inches tall.