Why does the Army not have as much pride as the Marines?

Once a marine always a marine. The army does not take this attitude 100 percent.

I truly don't think that they care about their branch as much as we Marines do about the Corps. Case in point. When I was stationed at the Marine Detachment, U.S. Disciplinary Barracks, Ft. Leavenworth, KS some of the soldiers from the Army side of the house came to us and asked us for help in setting up their celebration for the Army Birthday. Evidently they had never celebrated it in quite the same style as we Marines and wanted our guidance and expertise. So we gave them our assistance.

Doubtful, due to the size of the communities in question. When I was in, ('69-'71), we were told that upon completion of BCT, we were qualified to be replacements in a rifle platoon. However, when assigned to support AIT's, the warfighter spirit and attitude was downplayed, even put on the back burner, ("You're not infantry, your MOS is fill-in-the-blank"). Instead of focusing on what the Army's primary function is, it becomes an 8a-5p job, (no weekends or holidays), in BDU's. Every few years, the Army Commandant professes to change all that, reinstill the warfighter spirit throughout the Army. Not holding my breath.

Marine don't have that universal pride though. They put on a solid front when an outsider talks smack, so I guess that that way they do.
But if you talk to some, they will start talking shit about other regiments. And of course 03xx versus everyone else.

No offense, but you're kind of myopic for a senior leader. Maybe you should look at YOUR LEADERSHIP to figure out why your soldiers don't have pride in the Army.

CSM, I think Soldiers are every bit as proud as any Marine, but I think where you are off track is in the scale of the units you are talking about. The Marine Corps is a corps, about the same size as 18th Airborne Corps, and I don't think there are any Paratroopers less proud than any Marine. The problem with identifying with Big Army (of which you are a part) is the Army is organized at Division level. We wear Division patches, we have Division organizations, we identify as members of a Division, not a Corps or Army, or Unified Command. I am a Marne Man (Third Infantry Division (Mech)), I learned the words to the Division song before I leaned the words to the Army song. Personally, I wouldn't give a bean to be a fancy pants Marine. Divisions are the front line of combat units. HQ (Big Army) is where all the REMFs reside, I identify as an Infantryman in 3ID, not a REMF in Big Army, and that is why you do not see Soldiers identifying with Big Army, but with the Divisions they fight in. I have a son who identifies as a Special Forces Operator and another son who identifies as a Paratrooper. One associates himself with 10th SF Group and the other with 173rd Airborne. Each is extremely proud of who they are and the units they identify with, as I am with Mechanized Infantry and 3ID.

Also, unlike the Marines and some of the other services, we do not train as a general purpose Soldier, you go through Basic Training/Advanced Individual Training, or now called OSUT as an Infantryman, a Tanker, a Signalman, or other specialty for the most part. So while Marine Basic trains Marines, at Fort Benning I trained Infantrymen or as they call them now Warriors.

The Marines, to my knowledge (and with no offense intended to the rest), have always stressed "Esprit de Corps" , their History and the pride and honor of serving in an Elite Assault Branch. Disicpline and self-respect are a requirement and not an expectation. The Army Airborne, Special Forces, Rangers and other such units are to be considered Elite Forces.

My answer to the follow up question is no because our actual objectives and philosophies are not identical while some of our tasks are.

Interestingly I reading This Kind of War about Korea and the author just mentioned the Army receiving criticism after WWII that caused it to compromise for social approval and specifically that the Corps got to stay as it was because the Army was in the crosshairs not the Corps. Unfortunately he did not specify what external pressures he was saying the Army faced.

Because the Marines are assault, and the Army is a 9 to 5 meat grinder.
We get up, go to work, shell the fuck out of the enemy, advance, and setup camp.
Lather, rinse, and repeat.

Oh boy. Here comes this old stupid argument. The Army has lots of pride. Deeds Not Words. We are all great Americans. We are all full of pride. We all do our jobs.