I recently enlisted with the Army (31B) right after I got out of the Navy. Can I wear my medals and warfare pin in the Army?

DA Pam 670-1 22-5, "Personnel may wear service medals and service and training ribbons awarded by other U.S. Services on the Army uniform, except for the Air Force Longevity Service Award ribbon and Air Force, Navy, and Coast Guard marksmanship medals and ribbons. Personnel will wear service and training medals and ribbons awarded by other U.S. Services after U.S. Army service and training ribbons, and before foreign awards."

The entire section of 22-5 will shows line for line the authorized awards for interservice.

The wear of your warfare pin win will not be authorized, unless you were Navy EOD or NSW. In those cases certain Army devices would be authorized such as Airborne / Air Assault / EOD.

look at ar 670-1 It will tell you what you can wear and the order that you will wear it. It will be a little different and some will it depends on the medal so go do your homework.

DA Pam 670-1 22-5, "Personnel may
wear service medals and service and training ribbons awarded by other U.S. Services on the Army uniform, except for
the Air Force Longevity Service Award ribbon and Air Force, Navy, and Coast Guard marksmanship medals and
ribbons. Personnel will wear service and training medals and ribbons awarded by other U.S. Services after U.S. Army
service and training ribbons, and before foreign awards."

The entire section of 22-5 will shows line for line the authorized awards for interservice.