By the numbers: brother on the left, the WWII vet certainly pulled his uniform out of the closet a decade later to pose with his brother. Left brother probably hasn't worn it since the war ended as he hasn't even added the World War II victory medal that was approved after the war.
He is sporting a good conduct medal but without any clasps. You get a clasp (bronze attachment to the ribbon) for each year of good service (no reprimands). That he has this medal only one year out of a 4-5 year long war and that he is only a Private First Class, well, there's a story there...
His other medal is the European-Middle East Campaign medal with some campaign stars and possibly an arrowhead attachment signifying that he was part of a landing force or similar (think storming the beaches on D-day).
The hash marks on his lower sleve are for 6 months overseas service signifying 3 1/2 years in Europe.
His brother has combat unit epillets (dark fabric over the shoulder loop) signifying that he is combat-arms and a Combat Infantry Badge (he was a grunt - an infantry soldier who saw combat).
The first ribbon appears to be a Purple Heart signifying that he was wounded in combat.
He is not wearing a Silver Star (heroism in combat) - the paperwork for it was probably still in process and he was pinned later. The next medal is washed out and difficult to make out. I downloaded the pic and ran it through photoshop, brightness, contrast, levels, etc. The middle ribbon is the United Nations Service Medal.
And the medal at the bottom right is the Korean Service Medal with two campaign stars.
Below, the solo ribbon with the black spot in the center is the Republic of Korea Presidential Unit Citation. This is equivalent to a unit award of the Medal of Honor or Victoria Cross from the South Korean Government.
On his opposite right breast (our left in the photo) he has the American Army Presidential Unit Citation. Again, this is the unit equivalent of the Medal of Honor or Victoria Cross.
The remainder of the 21st Infantry arrived at Chochiwon by 7 July. Chochiwon was located along one of two roads to the Kum River and Taejon. The remnants of Task Force Smith the regiment by 8 July. 1st and 3rd Battalions repelled the North Korean advance until 12 July. During the Battle of Chochiwon, the 21st Regiment suffered 531 killed, wounded or missing. On 30 August, the 34th Infantry's 3rd Battalion became the 21st's 2nd Battalion. The regiment fought on the Naktong River line until 19 September. The 24th Division, including the 21st, was awarded a Presidential Unit Citation for its actions between 2 July and 15 September.
His rank shows him as an E-7, Sergeant First Class (5 ranks above his older brother) and he would have had a serous amount of responsibility and duties - especially for a young man.
His two lower sleve has marks indicate one year overseas service - probably 12 months in Korea in the war.
What we have here are two bona fide war heroes.