# In-Service Systems Sustainment (ISSS)

**Agency:** Homeland Security  
**Account:** Procurement, Construction, and Improvements  
**Source document:** United States Coast Guard · p. 6  
**Vintage:** President's Budget PB2027  
**Canonical URL:** https://hitchintel.com/budget/homeland-security/in-service-systems-sustainment-isss  

> **Trust:** parsed from the agency Congressional Justification. Approximate, **not summable**, verify at the cited page.

## Funding ($M)

| Fiscal year | Basis | Amount |
| --- | --- | --- |
| FY2025 | enacted | 30.0 |
| FY2026 | CR annualized | 30.0 |
| FY2027 | request | 45.0 |

The prior-year column is a CR annualized figure, not an enacted appropriation.


## Homeland Security discretionary budget authority (OMB PBDB — authoritative)

FY2027 $91.40B, FY2026 $88.60B. This is the agency total, not a sum of the parsed lines.


## What this funds

This investment supports the maintenance and replacement of critical afloat C5I systems to ensure continued operational capability. ISSS projects support the sustainment and replacement of critical C5I systems onboard NSCs necessary for


**Where it sits:** Civilian / Non-Defense › Homeland Security › United States Coast Guard › Procurement, Construction, and Improvements › Other Acquisition Programs


*HitchAI is an independent intelligence service, not affiliated with the U.S. government. Civilian line dollars are parsed from agency Congressional Justifications and are approximate.*