Is it possible to serve in multiple branches of the military ?

Yes I has several friend that has served in two branch. I also had one that served in three in the pass

You are I've served in the Marine Corps as an Infantryman, and currently in the Navy as a Master at Arms. Not all MOS's cross over. I have an Army MP in my unit who had to go through Navy A School even though it's the same basic job. I have also another in my unit who was Marine Corps Infantry, Air Force Security Forces, and now Navy Master At Arms. He did not have to attend A school transitioning from the Air Force. We also had a member go Air Force PJ from Navy and another go over to the Corps.

yes I served in navy, then the army and then retired from the navy. Here are the issues if you did marines first you never have to do boot camp again. When I went to army I had 40 plus mos that I was qualified for due to electronic background from navy, so going other way will require school. I find the army is more restrictive for promotion. Air force while it will take rank will not take quals and you will have to do all schools and quals equal to rank in 2 years which can be hard for higher ranks. most branches will not accept leadership courses and all will have to be done up to rank you are at before promotion. time in rate is lost. and if you have a break in service more then 2 years you will be demoted to e3 and below. navy has prior life conversion which can get you up to e6 but no time in service/rate. also there is high year tenure which can force you out before retirement. thus changing services makes promotions harder and retirement questionable. I find navy has best jack of all trades in schools where army teaches you to run or test or fix a single piece of equipment and another mos required for another job and when you get to staff sgt and above you are just admin with no hands on where navy you are admin but still subject matter expert for a large amount of equipment in your div.

Yes, I have a friend that retired out of the air force after his 20. His first seven years was in the Navy and he was RIF (Reduction in Forces) out. He then applied to the AF and completed his twenty...

I served 8 years in the Navy, Active, then did 9 years in the National Guard including a tour in Iraq. My job was basically the same, computers. I know people that have done active in both. There are programs run by the services where they recruit from one service to another, sometimes called "Blue to Green" Navy to Army, or "Green to Blue" Army to Navy.

Well, let's define served. I was in the US Navy, 1969 to 1973. Did two tours in Vietnam and came home at the end of my 4 year enlistment. I then joined the Army National Guard on a "Try One" program which allowed me to join at my active duty grade, E-5. After a year I could separate if I didn't like it. I stayed and went to the Oklahoma Military Academy for one year and was commissioned a 2nd Lt. in 1975. I retired as a LTC, Field Artillery, in 2000, 24 years later.

In 1974, I got a job via the Vietnam Veterans Readjustment Act with the US Air Force at Vance AFB, OK. I then served with the Air Force as a civilian for the next 34 years. My speciality was Financial Management and I served right along side Air Force personnel doing the same exact job.

So, I believe that I served for the Navy, Army and the Air Force in some capacity. I had different jobs in each branch of service, but I did my best and had a very rewarding career.

I can't really comment on whether you can go directly from one branch to another without some compelling skill. I was able to go from a Navy Radarman (Ops Specialist) to a Field Artillery Officer because I had the time to go to the Army schools and learn my new trade.

Still, you can serve different services if you're motivated to find out how to get it done. Please notice, I never served in the Marine Corps, although I certainly wish I had done so.

navy then air force so yes you can but its getting harder with the budget constraints etc

YES. People who joined, say the Army would join the Air Force once their Army hitch was done. When one service branch was short of people there was inter service transfers done. During Viet nam it happened at times. I knew X Navy and Army people, and one Marine that joined the Air Force.

Coast Guard as Active, then several years later, NAVY as Reserve .. Electronic Technician for BOTH.
Pick a field you are GOOD AT .. and that is NEEDED.

I started out in high school in Junior Army ROTC for 3 years, then 3 years of AFROTC in college as well as one semester of NROTC because I was fascinated with celestial navigation. I was comissioned in the Air Force and flew for 18 years, and then spent the next 20 years as a Navy defense contractor designing GPS systems. Experience in three services can give you a great appreciation for how to manage differing assets at the HQ and NAF level. It also gives you some insight when in an AOR, as to what other foreces capabilities are, and how to task them to work in consonence. I found myself once creating a tactical deception for the Navy to implement and my primary job was air asset tasking for the AF. Knowledge is power, but as others have stated here, don't cross train to another service before you know your current MOS. Your knowledge becomes useful to other services in the E-5 and above range.

I did. I first entered the Army in 1979 and served till 1986 working in MI (Berlin, Ft. Meade) and then entered the Air National Guard in 1986. Except for a break sometime around 1994/95 when I made a brief change to the Army Reserve, I wound up serving 14 years in the Air Guard. I went into the Air Guard specifically for the advanced training in satellite communications electronics I received.
In the Air Guard, I served in three squadrons, 2 of which were Combat Communications Squadrons and the third was an Air Control Squadron. I saw more of the field working in these tactical units than I did when I was in the Army. There are parts of both services that I miss, giving me a split personality at times ;-)
Serving in more than 2 services may give you a bigger adventure, but I'm not sure if you'll advance as far as you want to. But maybe that's not that important to you. The other problem is that some of the other services may require you to go through basic/boot camp again, which is not exactly what I'd be looking to do.

I entered the Marine Corps in 1980 did
four years after which I enlisted in the Navy and did eight years. I finshed in the Air Force retiring with a total of 21 years.

Not sure I could offer any good advice on how to accomplish this goal, however.... I do know of individuals that have served in three separate branches after 12 years of Active Federal Service. I believe they had breaks in service, which I don't think had much, if any effect on their transition from one branch to the next.

Yes you can serve in other branches of the military after you are discharged from your current service branch. You will have to check though because there are other factors at work here. I haven't seen any go from the Army to the Marines, but the other way around. My uncles started in the Marines and Army respectively then both switched to the Air Force. They both also served in the Korean War.

I started playing off with 2 1/2 yrs in the Army Reserve, I was able to get released and then spent 20 yrs in the Navy.

I did. I served 4 years of active duty in the Air Force as an aircraft hydraulics journeyman, and after I got out and moved back home to Texas, I joined the Army National Guard for 6 years. One thing I can say is there is definitely a difference between branches. You really see that when you serve in more than one. Me personally I enjoyed the Air Force more, mainly because of the job I had while I was in

Yes you can as long as you have a good discharge. My brother was drafted into the Army in 1970 and in the mid 70s he joined the Marine Corps Reserve.

I started my career in 1974 in the Army. Got out in 1981 and went into the Air NG. From there, I went to USCGR and in 1985, the Navy came to me. I went into the Navy until my retirement in 1998. I have a total of 24 years in the U.S. Armed Forces. Would not trade a minute of it. I should add that I stayed in Law Enforcement those 24 years and became a federal officer from 1999 until my retirement in 2011.

I think you need to focus on whichever branch you join first and foremost, and the reasons you chose that. It's not like working all the departments at Target, you should be building some love of whichever branch you join.

I joined the Marine Corps and loved it, but when I got out there were no reserve units close enough to me. I joined the National Guard because I had friends enlisted, and I ended up retiring from the Guard with almost 25 years total. I enjoyed the Guard, met some tremendous people, but my first love will ALWAYS be the Marine Corps.

Do yourself a favor, focus on whichever branch (I think you said "Army".) If it's the Army, be Army Strong, Be All You Can Be (Just don't be an Army of One, those folks suck!)

Just one at a time, I have known people that have changed service branches, that's their choice if they chose to do so. Myself I enlisted in the Air Force and never had any intention of changing to another Branch of the service and didn't. One friend however, was Navy, came to USAF and later returned to Navy, He felt more at home there. Worked with a few that went from the Marines to Air Force. Some with Army backgrounds went to other services or from other services went Army. Although each branch serves the United States once You have found a home and are comfortable with it there are adjustments to any change. Each person has to decide for themselves how well their skills will transfer into another service, how far back may this put Military career progression and what is to be lost or gained by the transition. You have to choose whatever path You are comfortable with but whatever We have in common there are differences. Keep in mind there are hundreds of different jobs You could have in each individual branch of the service and maybe cross training is better than finding a new home. In the long run a decision You have to male Yourself. Whatever You do don't do it on an impulse, look into it first, research then decide.