Research · Defense budget · Public finance
Where Defense Funding Grew: 1998 to the 2027 Request
The FY2027 request is $1.45 trillion, 40% above this year in real terms and 39% above the 2008 peak. Half of it is equipment and development, up from 28% in 1998. What the increase buys, title by title and program by program.
OVERVIEW
Where defense funding grew
A re-equipment budget: half investment, personnel below 2008.
What this is
A reading of the Department's own budget documents: thirty years of funding by title in constant FY2027 dollars from the Comptroller's Green Book, and the FY2026-27 program and portfolio detail from the FY2027 request, to see what is actually growing. One mover, missile defense, comes from a non-government tabulation and is labelled as such.
The main finding
The request is a re-equipment budget. Procurement and R&D are 52% of it, against 28% in 1998 and 36% at the 2008 peak. Personnel funding is below 2008 in real terms. Three portfolios (missile defense, space, counter-drone) account for most of the comparable year-over-year increase, and science and technology falls while R&D rises 60% in real terms.
The size in context
$1,450 billion in FY2027 dollars is 39% above the 2008 real peak and 2.7x the 1998 level. In nominal dollars it is 5.6x 1998; the difference is inflation, which the constant-dollar view removes.
What to watch
Whether the appropriations bills fund the request's composition or only its total; whether S&T is restored; and whether the 26 portfolios with no 2026 baseline get one, so that next year's growth can be measured.
01 | THE LEVEL
The 2027 request is a new real peak
$1,450 billion in FY2027 dollars, 39% above 2008.
EXHIBIT 1 | FY2027 Green Book, Tables 6-1 (total obligational authority) and 6-8 (budget authority), constant FY2027 dollars. Historical years include subsequent adjustments; 2026 is the current budget; 2027 is the President's request. Both series exclude Department of Energy nuclear programs.
Three eras
In today's dollars, funding rose from $545 billion in 1998 to a $1,041 billion peak in 2008, fell to $784 billion by 2015, and recovered to $1,038 billion in the current 2026 budget. The 2027 request, $1,450 billion, is 40% above 2026 in one year.
Two measures, one caution
Budget authority and total obligational authority usually track each other. They diverge in 2025 and 2026: budget authority was $1,052 billion in 2025 and $882 billion in 2026 (nominal), while obligational authority was $887 billion and $1,015 billion. That pattern is what multi-year funding enacted in one year and spent in the next looks like. Year-over-year comparisons across 2025-27 are made on obligational authority here.
What a request is
The 2027 figure is a request, not an appropriation. Every prior year in the exhibit was enacted and then adjusted; the request has been neither. Its size is the subject of the rest of this piece, not its likelihood.
02 | THE TITLES
Equipment and development, not people, drove the growth
Procurement and R&D each grew about fivefold in real terms since 1998.
EXHIBIT 2 | FY2027 Green Book, Table 6-1, constant FY2027 dollars. Military construction, family housing, revolving funds and other titles are omitted here and shown as 'other' in Exhibit 3. A funding title is a category, not a program.
The multiples
From 1998 to the 2027 request, in constant dollars: procurement 4.9x ($84 to $413 billion), research and development 4.9x ($70 to $344 billion), operation and maintenance 2.1x, military personnel 1.2x.
The last step is the largest
Procurement rises 81% in real terms from 2026 to the 2027 request and research and development 60%. Each would exceed its previous real peak (procurement $254 billion in 2008; R&D $214 billion in 2026) by a wide margin.
What did not grow
Military personnel funding in 2027 ($205 billion) is below its 2008 level ($228 billion) in real terms. Operation and maintenance is 10% above 2008. The force is not being paid or operated at a much larger scale; it is being re-equipped.
03 | COMPOSITION
Investment accounts are now half the budget
Procurement plus R&D: 28% of 1998, 52% of the 2027 request.
EXHIBIT 3 | FY2027 Green Book, Table 6-1, constant FY2027 dollars. 'Other' is military construction, family housing, revolving and management funds, and trust and receipt items.
The shift
In 1998 personnel and operations took 68% of the budget and investment 28%. In the 2027 request the two halves have swapped: personnel and operations 44%, investment 52%. Even at the 2008 peak, investment was 36%.
Why composition matters more than the total
A dollar of procurement buys something that exists for decades and has to be operated and maintained; a dollar of R&D buys an option on a future system. Neither shows up as capacity this year. A budget that is half investment is a claim about the next fifteen years, not about the next one.
The question it raises
If half the money is buying and developing equipment, the operating and personnel accounts will have to grow later to use it. The 2027 request does not show that growth; it shows the purchase.
04 | THE MOVERS
Missile defense, space and drones carry the increase
Three portfolios add $94 billion between them.
EXHIBIT 4 | FY2027 Budget Request Overview Book; missile defense and defeat from the Center for Arms Control and Non-Proliferation (CACNP, a non-government group), FY2027 briefing book, comparing the FY2026 and FY2027 requests. Only items with both a FY2026 and FY2027 value and no scope change; portfolios and programs overlap and cannot be added. Space FY2026 is an estimate backed out from a stated percentage. Golden Dome ($17.9 billion) has no FY2026 line; THAAD's scope changed and is excluded.
Where the new money goes
On the Center for Arms Control and Non-Proliferation's tabulation (a non-government source comparing the FY2026 and FY2027 requests), missile defense and defeat nearly doubles ($43.3 to $85.8 billion). In the Department's own figures, space more than doubles on an estimated 2026 baseline, and counter-unmanned systems rise fivefold. Portfolios and programs overlap, so these changes cannot be added into one total.
The nuclear line
Columbia-class submarines, missile warning satellites, Trident modifications, the long-range stand-off weapon and the airborne command posts all rise. The B-21 falls by $4.0 billion from its 2026 level and the sea-launched nuclear cruise missile goes to zero in the request. The nuclear enterprise as a whole is $71.4 billion in 2027; it has no comparable 2026 line.
What is not comparable
Twenty-six portfolios in the request (air power, sea power, munitions, industrial base, readiness) have no 2026 equivalent in the Overview Book. They describe the request; they cannot yet describe growth.
05 | RESEARCH MIX
R&D grows; science and technology does not
S&T falls to 7% of R&D in the request, from 13%.
EXHIBIT 5 | RDT&E: FY2027 Green Book Table 6-1, total obligational authority, nominal. Science and technology (basic research, applied research, advanced technology development): FY2027 Budget Request Overview Book, Fig. 3.1, including mandatory funding. Different documents and scopes; the ratio is indicative, not an official figure.
The split inside R&D
Research, development, test and evaluation rises from $210 billion to $344 billion. The three science and technology accounts fall from $27.8 billion to $25.7 billion: basic research down $0.3 billion, applied research down $1.8 billion, advanced technology flat.
What that means
Almost all of the R&D increase is in the later budget activities: system development, demonstration, operational testing and management support. That is money that turns a chosen design into a fielded system. It is not money that looks for the next design.
A ratio to watch
S&T at 7% of R&D would be the lowest share in this three-year window by a wide margin. Whether Congress restores it is one of the more informative things the appropriations bills will show.
06 | WHAT THE INCREASE BUYS
What the increase buys, and what it defers
The purchase is in the request; the operating cost comes later.
How to compare years
Use constant dollars and total obligational authority for any comparison that crosses 2025, when budget authority and obligational authority diverge. Every figure here traces to a source document listed below.
For the budget debate
The interesting argument is not whether $1.45 trillion is large. It is whether a budget that is half investment can be operated at the personnel and maintenance levels it proposes, and whether development money that is 93% outside science and technology is the right mix for a force that will be bought over the next decade.
What would change the picture
Enacted 2027 appropriations that alter the composition; a Green Book revision of the 2025-26 budget authority figures; or a 2026 baseline for the portfolios that currently have none.
Limits
Green Book historical figures include later adjustments and are not the original appropriations. Budget authority and obligational authority are different measures and are not mixed within any exhibit. Program and portfolio rows overlap; they are never summed with title totals. The Space 2026 baseline is an estimate. Nothing is a forecast.
Conditional implications, not forecasts.
Sources: FY2027 Green Book (Office of the Under Secretary of Defense, Comptroller), Tables 6-1 and 6-8, nominal and constant FY2027 dollars; FY2027 Budget Request Overview Book; FY2027 Mandatory Funding Overview; FY2027 O-1 exhibit; Center for Arms Control and Non-Proliferation (non-government), FY2027 Defense Budget Briefing Book. Every data row, with its source document, is in the data files that accompany this article.