---
kind: "unit"
title: "51"
title_heading: "National and Commercial Space Programs"
key: "stII/ch201/schIV"
level: "subchapter"
label: "Subchapter IV"
heading: "Upper Atmosphere Research"
release: "119-102"
date: "2026-07-12"
url: "https://uscodex.org/usc/51/stII-ch201-schIV"
sections_count: 4
---

# Subchapter IV — Upper Atmosphere Research

Title 51 — National and Commercial Space Programs › Subtitle II — General Program and Policy Provisions › Chapter 201 — National Aeronautics and Space Program

## Sections

- [§20161. Congressional declaration of purpose and policy](/usc/51/20161.md)
- [§20162. Definition of upper atmosphere](/usc/51/20162.md)
- [§20163. Program authorized](/usc/51/20163.md)
- [§20164. International cooperation](/usc/51/20164.md)