Hello Greeninvestor.
Brian. Graham.us.army.Mil is not a valid US army email address. Someone is just trying to make it look real.
Please post a sample of the emails ( after removing your personal information ) and then we will be able to give more information.
It is ALWAYS a scam
If the pet seller or shipper asks for money to be sent via Western Union, Money Gram, any brand of gift card. Walmart To Walmart , Zelle , PayPal friends and family option, or mentions Cameroon