Specifically, Veterans who served at least two periods of service—one that qualified them for the Montgomery G.I. Bill and a second that qualified them for the Post-9/11 G.I. Bill—may be eligible to receive up to 12 months of additional G.I. Bill benefits (bringing them to a total of 48 months).
A Chapter 35 spouse may receive an extension equal to the period of call-up plus four months for each call-up. These orders must be under Title 10 Sections 688, 12301(a), 12301(d), 12301(g), 12302, 12304 or if involuntarily ordered to full-time National Guard duty under section 502(f) of title 32, United States Code.
You may receive a maximum of 48 months of benefits combined if you are eligible for more than one VA education program.
If you have 2 or more qualifying periods of active duty, you may now qualify for up to 48 months of entitlement. You must be eligible for the Post-9/11 GI Bill (PGIB) and the Montgomery GI Bill Active Duty (MGIB-AD).
Specifically, Veterans who served at least two periods of service—one that qualified them for the Montgomery G.I. Bill and a second that qualified them for the Post-9/11 G.I. Bill—may be eligible to receive up to 12 months of additional G.I. Bill benefits (bringing them to a total of 48 months).
A Chapter 35 spouse may receive an extension equal to the period of call-up plus four months for each call-up. These orders must be under Title 10 Sections 688, 12301(a), 12301(d), 12301(g), 12302, 12304 or if involuntarily ordered to full-time National Guard duty under section 502(f) of title 32, United States Code.
As a son or daughter (including stepchild or adopted child) you can generally receive benefits under Chapter 35 from age 18 to 26 (8 years). Under certain circumstances you can begin before age 18 and continue after age 26. You can receive payments under Chapter 35 for a maximum of 45 months of full time benefit.
For MGIB-AD claimants, the delimitating date is 10 years after the last release from Active Duty (later periods of active duty must be 90 days or more). For MGIB-SR, the delimiting date is 14 years after the date the claimant becomes eligible or the date he or she leaves the Reserves.
Through the STEM Edith Nourse Rogers STEM Scholarship, Post-9/11 GI Bill® students who have exhausted or are about to exhaust their entitlement may be eligible for nine months (up to $30,000) of additional benefits.
The post 9/11 GI bill is almost always better for attending college than the MGIB and the MGIB is better for apprenticeships and job training. You can use the MGIB for 36 months and then use the post 9/11 for another 12 months but you'll miss out on all that BAH for 36 months.