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

Because...It has become a "mute issue" and treated like a "non-essential" subject because it "interferes" with "mission" goals and purpose!
I have been retired for 6 years, finishing a career from "75 - 13". Even though there was a "moral" issue coming out of a "Vietnam" issue, the "pride" issue was not a problem where I was.
As a "Senior NCO" (E7-9) I pressed for "Heritage, Customs and Courtesy" along with mission, schedules and the "I'm a Combat Soldier" mentality.
Those coming up through the ranks during the last 17 yrs of the "Global War" have repressed the need to "instill Pride in all their subordinates"! The only pride these leaders had or have was the pride they could get pinned on their ASUs!
"If there is not "History, Heritage, Pride and Purpose" given or directed toward those we "Senior NCO" lead, we will not have the "Pride" that is equal to that of the other services! "TEACH THE JUNIOR NCOs"!

Absolutely with personal responsibility, from my own experience in the corps if you mess up you mess up not your chain of command in the Army we but blame everywhere but the individual just like the responsibility of accountability it is everyone not the individual adult. (Just my thoughts.)

I wrote this response regarding another topic. ("I've always known to salute Warrant Officers. Now I hear that we don't need to. Am I missing something?") I believe it is also appropriate here. Here is that reply.
It never ceases to amaze me. Why oh why is it almost ALWAYS the Army? If there is a question regarding military protocol, uniform regs, basic frigging common sense, etc... it seems like it always has something to do with the Army. I do realize that no other branch of the military is as strict, as rigid, and as uncompromising as the Marine Corps. But, the Army seems to be a glaring example of non conformity. How in the hell do "soldiers" graduate boot camp if they do not possess the "BASIC" knowledge required to exist in the military? Until I joined this site and was exposed to this level of stupidity, I thought making fun of the Army was just Esprit De Corps. It now seems to me that, for the most part, the Army is one huge cluster f**k.

Just because the Army's indoctrination involves less of it's own cheerleading and doesn't promote a cult mentality among it's members doesn't mean we're not proud of our branch.

The honor of the regiment has been an Army thing since at least the Civil War and possibly since it's founding. Elementis Regamus Proelium

Yes we have the same pride and Hooah the marines do. I have worked with all the services We all have good and bad but I will put my Soldiers against any other service. It’s the attitude and good and bad Hooah

Army has pride in their branch and unit especially in the units or branch history. The Army also doesn't have a very inspirational song like the Marines.

By the time I retired, I had already noticed that soldiers dont take pride in their service, they more or less treat it like a job and a place to get off the streets of America. I often seen way to many soldiers who shouldn't have been progressing as fast as they should have, but, when your drinking and hanging out with your NCO'S in your off time... well, I think I am making my point. Either way, their is no Army wide pride in service and NCO's are not upholding standards of the look of soldiers... Hair that is not regulation, uniforms that are to big and sagging, etc. Until soldiers are held to standard there will never be the pride of service like the Marine Corps.

"I would like to hear thoughts as to why Soldiers seems to talk bad or dislike the service that I love." The Army is a giant bureaucracy that often hypocritically contradicts itself and can't even agree how to wear a patrol cap. There are numerous Soldiers that don't know regulations or simply ignore the regulations that try to implement "one size fits all" policies that screw over Soldiers in the name of reducing the staff's workload. Slang and obsolete terminology often dominates over official nomenclature and current terminology making it nearly impossible for Soldiers to find information in doctrine. The reasons Soldiers dislike the Army are plenty; not to mention all the BS like this: https://taskandpurpose.com/mattis-niger-ambush-blame/

The USMC has the best brainwashing and marketing of all branches. The entire Marine Corps is smaller than just the Army Reserve yet USMC merchandise sales (stickers, hats, shirts, mugs, posters, etc.) rivals Army sales and there are far more Army Soldiers (currently serving and veterans), than Marines.

The USMC is so small and the turnover is so high, that it is easier to retell more tales with heroic pride and eliminate things that are unwanted or embarrassing. They are able to stay on message and indoctrinate their members far better than the other services. There is also a personal pride and near universal peer pressure that embraces and emboldens "Semper Fidelis". This is often reinforced daily in their customs, traditions, and service mythology. Marines are often required to memorize and repeat their mythology at various schools and selection boards. It is also a point of individual pride to out do other Marines in being able to recall or recite the more obscure aspects of USMC trivia/lore.

Every service has it's own mythology, legends, and fairy tales, but the extent that Marines as a whole seem to believe the tales appears to be far greater than in the other services. Explaining to a Marine that one of their fairy tales isn't true is sort of like telling a kid that Santa isn't real.

Take the tale of "blood stripes" as an example. Every Marine is taught that the “blood stripe,” commemorates Marines killed in the battle of Chapultepec in 1847. However, the reality is that the wearing of stripes on the trousers pre-dates the battle. In fact, Marine Corps trousers from as far back as the 1790s had red welts and piping down the outer seams. I believe only one Marine NCO was killed in the battle too.

https://www.usmcmuseum.com/lore-of-the-corps.html
https://taskandpurpose.com/everything-know-marine-corps-uniform-wrong/
https://archive.org/stream/MarineCorpsLore#mode/2up