Hello Bobby,
Warmest welcome here to the forum, glad you could join us, hope you will hang out and stay awhile. Don't know what all info you do have, but here are a few things that might get you started. According to the online enlistment records your great-uncle was inducted at Camp Lee, Virginia on 18 March 1942.
Stanton's "World War II Order of Battle" tells us the following about the 61st Engineer Combat Battalion:
Formed at Atlantic Beach, Florida on 25 JAN 1943
Departed New York on 24 MARCH 1944
Arrived in England 4 APRIL 1944
Arrived in France-ETO on 1 JULY 1944
August 1945 location: Mulheim Germany
Deactivated 18 SEPT 1945 in Germany
Campaigns: Normandy, Northern France, Rhineland
Here is a thread on the forum involving the 61st ECB that has some interesting items you should check out.
You may have noticed that your great-uncle's induction predates the formation of the 61st ECB by nearly one year. So most likely he was with another engineer outfit before coming to the 61st. This is not unusual, there were new units forming all the time during the course of the war and a few men with prior training were transferred to the new ones to give them some experience to go along with fresh recruits.
Marion has provided a great resource here in the Help Section about finding veterans records, check it out.
Here is something I think is kinda cool. The above photograph is of my grandfather taken in 1945 at the Henri-Chapelle cemetery. According to the American Battle Monuments Commission website, your great-uncle is buried in Plot F, Row 9, Grave 20 at Henri-Chapelle.
https://abmc.gov/node/377692#.WN34Hm_yvIU
I did a lot of research on this picture and I know exactly where my grandfather is standing within the cemetery. This is Plot F, the same plot where your great-uncle is buried. My grandfather is looking at Row 3, Grave 1, your great-uncle's grave location would be in the background to his right.
Let us know if you have more questions and good luck with your search Bobby!
Randy