First document:

FOR OUR SOVIET MOTHERLAND!

USSR

CERTIFICATE

For the heroic defense of

CAUCASUS

lieutenant-technician (first lieutenant in engineering military of Red Army)
Ovcharenko Nikolay Gavrilovich

By the Order of the Presidium of the High
Council of the USSR dated on 1 May 1944
is awarded with the medal

"FOR THE DEFENSE OF CAUCASUS"

In the name of the Presidium of the High
Council of the USSR the medal "For the defense
of Caucasus" was presented on 23 February 1945

L № 016574 (I think the serial number of the medal/certificate)

The commander of the 95 Separate Construction Battalion (I don't know how they are called in NATO armies. So it is the literal translation) of the Black Sea Fleet
(the position, the military rank and)
major [signature] /Skvortsov/
(the signature of the person who presented the medal)

Stamp on the first document:

95 Construction Battalion of the Black Sea Fleet